Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c194d147c991441…

MALICIOUS

PDF

90.4 KB Created: 2021-09-18 21:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb7287e6313e2065e22001025a2c0a81 SHA-1: fa804e62def1e73d4e9381d13ff23f9dfda030a0 SHA-256: 6c194d147c991441564d4bbc2a69aae56db2b7cb86b6e1543c7d3d76b4d0b698
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, a common tactic in callback phishing and tech support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may host or link to malicious content, potentially exploiting PDF vulnerabilities or leading to further compromise. The presence of numerous links to compromised WordPress upload directories and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457934c99b4---somavejagebowub.pdf In PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/fazafixixagojodopibuka.pdfIn PDF document text
    • https://olterus.info/contents/files/8633034917.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/93050025195.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/fuleviresubowisu.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/xoluruniwuvezaribib.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415007302d5---16097096601.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wepebi.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/morimalefojuk.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/xugaxajusokex.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457ead619c9---wojulesotejexuzadisokiw.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210919_21FBC1EA901F622A.pdfIn PDF document text
    • http://meskerjager.nl/media/files/51880340105.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vojexozel.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/4906973301.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/16557846388.pdfIn PDF document text
    • http://speckrepej.com/upload/file/fajomufakimetuvasebif.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/duzuvije.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614082bf1299a---37424787660.pdfIn PDF document text
    • http://aurora-c.jp/files/files/zepitabibelujiviza.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/23294554122.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/25601410424.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/rokeropobexobilagemeba.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/19522850467.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/nilepaxoxun.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/naponoderajarovatole.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/durekenunaloma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+notifications+light+up+lock+screen+androidPDF 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_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 11336 bytes
SHA-256: 6809984f3276b47568066f3cbb398ec0a0bd8e237a8dee307bdd884f371339f9
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 19592 bytes
SHA-256: 24431df11ac31eb29db0373790379e4f1df50327789ac8a8b7f246c949e79f61

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