Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8378f30c534cd1b…

MALICIOUS

PDF

112.8 KB Created: 2021-08-20 03:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8237d644238606deb848fac72f98db27 SHA-1: 927859840c4acc7192e004c6c54e7f857cc04806 SHA-256: c8378f30c534cd1b678becfd9ad54156d9facfb7fb9995841dc097f2faf083a9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating an attempt to direct users to malicious websites. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, although no specific phone number was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://easyliveconstruction.com/ci/userfiles/files/safinefef.pdf In PDF document text
    • http://kfbi.ru/content/file/67359044262.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/zobudunibu.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/8267846913.pdfIn PDF document text
    • http://wsm.hk/images/files/sekenadowulolibav.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/52780622796.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/83891796440.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/zivolujinaxona.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ad757cd59---88944065631.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/27064414335.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6060445c6f---kenukujepanagunoduladojux.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/84974572257.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bfa4434913ffb22b121788a799596963/duxiluzudutu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/e398glgd6m3lok4gm0vopl0m3e/jogevewexo.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/46494765164.pdfIn PDF document text
    • https://profesa.net/userFilesfile/3501019481.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kulunutubez.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706863dfa08---webupawag.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b628869a865---56344338763.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/65034152370.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b5bfcb3e2c410f3e319029f7dc66bd59/zuvivokuzipevarapisimi.pdfIn PDF document text
    • https://noddy.nu/images/file/vefufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=where%27s+my+water+2+level+47+guest+starPDF 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_off000152c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 18240 bytes
SHA-256: 1e614141ecde715a1f8fe60c002c81e20d392493982f3fa158ab7fd90fbe35d3
font_01_sfnt_off0001833c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1833C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B53 10880 bytes
SHA-256: f857885718031c9546b2ba1b39517253b0881d09643ab1f479aaaa18f6ed01c9

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