Malicious PDF — malware analysis report

Static analysis result for SHA-256 443fe8791d486bd5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8189dc4e0730f1922a4d7beed01b9b6f SHA-1: 8d25502dad068393bf99fa36147d7b04b1d41942 SHA-256: 443fe8791d486bd52d6f00553783561dbac7a26532fb1973f75ddf2bae38fe78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf02a6f3b---96653834919.pdf In PDF document text
    • https://hamzakocakoglu.com/userfiles/file/71894025021.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fd15e458d0432ec8c16ca0f9ffa47c2b/jamemitoxelepe.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c487c5e644---pewetarofasipuno.pdfIn PDF document text
    • https://grouptm2.com/contents//files/6534542305.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/61980152794.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wujiperuvavuva.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/84051490595.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081883c12d5d---66379963327.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/mifipobika.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/k2u6jahd1v24ndf2mvo616nsfq/8017434934.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f781a80a53---gobivafawiremav.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/lr6c70hcg1ra5dscsp6457ufmp/93896646684.pdfIn PDF document text
    • http://zerosquareonline.com/file/32376348225.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608677038d713---zetegululegagesobek.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/29033493938.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608c804e2d6a2---xoboxenesuvixonozo.pdfIn PDF document text
    • http://charivne.info/images/file/zurasolafadotojagisowasep.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5d9adac6---furixesanugubotibato.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/51800488431.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/batun.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/dukat.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/sizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cold+beach+day+outfitPDF 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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 18516 bytes
SHA-256: a3a2b1ec0273e2cd45858c27b643d6fa1b7e9f557ed7d2566a48e7922e00b170
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10588 bytes
SHA-256: d8ec4b9d27e6a8acbce9b2a592d41234a115bcf392d49b7acd14927e5258d600
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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