Malicious PDF — malware analysis report

Static analysis result for SHA-256 3695272a9da3f93d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 10:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6b422ed87b1609ac7d47a2e7908fdb3 SHA-1: 39843c8827c7cf3a107eb56f9a69be00b4749d39 SHA-256: 3695272a9da3f93d15c811377cf5894ee1927e91ecf12c8669e705e386dbdb6b
236 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'Fake CAPTCHA' heuristic indicates the document's intent is to deceive the user into performing an action that would typically lead to malware execution. ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://knuhpharm.kr/userfiles/file/20210907003143.pdf In PDF document text
    • http://bezagsecurity.cz/userfiles/sexazegupagi.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/90904001124.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/sabovutadup.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/pekavijanixomilumuzike.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8aildeiupu6q0fnpdpnt7qdo7/42028665312.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/36593149124.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/85560708632.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/rinisumalokelujelameriz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ebc445405---xowilumelimo.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/modujupegorogusigoxeror.pdfIn PDF document text
    • https://teamcode.net/upload/files/pefaxemegolaju.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vetajajutume.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3b7b642997070a01c45d2924ade1d392/fodudunoxinogojinosesew.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/21403125380.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/relatezasejexateda.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wivesuti.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/7554891713.pdfIn PDF document text
    • http://pactolous.hu/upload/file/fisexiza.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/26730255340.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/49497938646.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/18314771316.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/23253986863.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/34406137227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apk+hello+neighbor+2PDF 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_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 10436 bytes
SHA-256: 75756cbec97b3139b965a2f1bb6b8a21e97c263c8871dc10fd5e464322ff4663
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 18660 bytes
SHA-256: 66d84e272649e92f7a45b791db818c305f661ba664e3fdbe7ebb0a9e691ed9ca
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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