Malicious PDF — malware analysis report

Static analysis result for SHA-256 56769af47f2bb38b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 07:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca03f0872531ee64690a2eb952932c4f SHA-1: 9c3ffc3d7740bc2b399c0a6aa32af4e63f9934c6 SHA-256: 56769af47f2bb38b9972bba48f4f400bb47e8cae5baa7960f78a635db0cb60a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The heuristic 'SE_CALLBACK_LURE' also suggests a phishing or tech-support scam pretext, which is consistent with the use of link farms to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=energy+transformation+worksheet+with+answer+key PDF link annotation
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/rumurosunitonoporur.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/46812101902.pdfIn PDF document text
    • http://araratmebel.ru/img/file/96198024923.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/wupatapevizow.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097df4f56c57---xomukasulagaziguguzoge.pdfIn PDF document text
    • https://fultoys.com/userfiles/5253410181.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/61512096340.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/sunoxoliderumigukifuxexe.pdfIn PDF document text
    • https://bamor.org/userfiles/file/dinapofegijuf.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/gunutow.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/24506366785.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161235bd49ca1b---10640864964.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3d1dd09b1---xibevekamepitadeparelekub.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85ef92cb4---32727250398.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/17156759200.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/76750614422.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ae19fea86c6e9d0656aa9b27f2ac0dd7/zadavuluxuvufisexuneze.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/desuvasunarobadeva.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/81907193936.pdfIn PDF document text
    • https://digireg.cz/upload/42153317518.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9714660cde---21025110160.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/86220808642.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/gemilukodoxutisosof.pdfIn PDF document text
    • 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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10892 bytes
SHA-256: e413f6c8323a03b190736891d2b4c5768a0fc659ee5b085df4c82bb87346ddbc
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 18220 bytes
SHA-256: b19a44bbf2107e2ce3c9eaf848888c38673a233b6d1ff5bbb742eef3778ca639

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