Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74eb4277e92ae81…

MALICIOUS

PDF

108.0 KB Created: 2021-06-26 23:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ef370f9be16b56b61aff54669b319b3 SHA-1: 6a11a13faf3b01fc5f4fd0172f86af16a98c1c32 SHA-256: a74eb4277e92ae814324bac8130008a5db44348d67f70552fdcbed99a828292b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially malicious content strongly suggests an intent to redirect users for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4cdeb7ad1---ropagatediloba.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/62db9d3b249bfd87b0bfb8e9d40df4a1/15225920734.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/h1jj5d29u1sifkreeao0rohqe5/sodaro.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mldh9166trq38pdnsqm9ulv09u/27889847978.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8316699da---46991952690.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acad8a71b69---towilarimunoxisunit.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d2185901---59894699879.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/45828826781.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb5550d3e---xajuvemajutuguzix.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sqo1ogk646gcnums9oe7cagiu2/11824187262.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/19435358905.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd10fe9b04---52363047378.pdfIn PDF document text
    • https://airbays.com/userfiles/file/93559799344.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/21o9h67f1chq6ip0tncpauof73/bedilusitemiga.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kezutisenibozu.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/mutofubugasefilemasafate.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/66847280265.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/5325616598.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/xirojadexujuwadunuje.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2da76f0e29358d5a42bf25507feb65aa/jamit.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab37095e04c---1650972669.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e01bec85---352461161.pdfIn PDF document text
    • http://canvangdientu.com/images/file/labazijadedilumuxeb.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079543739c21---34098846653.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/527b6c01091dc2f5e5ad0e346fb92af0/sokofenikalaruvamoner.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ba980539c9e89d15f8b0b0d8b2c2ec05/78164872102.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k8699m90g3v4b6glips7p1dqr6/82524576022.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/31533961093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=clarence+bruce+springsteenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 18192 bytes
SHA-256: a09c70840d169ccb0afb2d1b89ae57678d02ec45834f25c0d40c1d13942678c0
font_01_sfnt_off000171f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F1 10700 bytes
SHA-256: 2574304fa53b85f6983d303ccdfbb2ec79fb398d3a50a7ccc6a579fea71e4791
font_02_sfnt_off00018a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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