Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b670038186cce42…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 02:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d81aeec98a76c32ef906e7673922c55 SHA-1: fb9a27d9185a3b65132e695722da7c6649580edc SHA-256: 7b670038186cce427b7952ecf5d076d530b796e5194a71cb39073e09f71e2294
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing attempt, where the document likely prompts the user to call a number for a fake issue. While no scripts were extracted, the presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 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 https://accuratesearch.com/userfiles/file/kupavonunidomubelugasedug.pdf In PDF document text
    • http://studiotecnicodama.it/userfiles/files/9268372569.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139368755271---46977906697.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/fojonifejoxokiz.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/rapemixajamu.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/43886941261.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/48701363604.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ef12797a---legebox.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/boruwolevu.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tesis.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa1b210305---65839544877.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/fupebuxugem.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/356d501d99d2e8f7ad55a48dc1d724b4/somusex.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/lejenalasaxuwaxipuxor.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/bekamape.pdfIn PDF document text
    • http://belean.pl/userfiles/file/64596790459.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/kibaridetinagu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/98515e6316253e4e223a9eca4872f076/33084405393.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2572dffe---terilisivuxenejidukujoj.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/posanekikidorejizerubiz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v25oi8s2npb90e78tic1j4ppi3/75696367976.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/lutudeduruduburosa.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/29622236260.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08557c9f6---70733382811.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/73783580312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=additional+file+for+asphalt+8PDF 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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 18044 bytes
SHA-256: 4f1ac17ead776be4409439c6a21f146b98cd5aa69c5af0a4f5cc079a86c0d7f0
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10784 bytes
SHA-256: 51cf0a5016ede9d173b672dda66fb192c326ced7aafd205280db3248d7217d18

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