Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af2bae78cb43ed0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 10:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39279180aa4dd4312bbf6bf8408da6ad SHA-1: b5f90e614c0983ee7cd7c34ac6b4b26afd2dcde3 SHA-256: 1af2bae78cb43ed0ada39815f7cc909e99a788df297fcdc4e7f25a3f80c73c45
176 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to potentially compromised CMS upload directories, suggests an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated, preventing a direct analysis of its content, but the heuristic findings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mp2020.csysadmin.com/ckfinder/userfiles/files/dipuni.pdf In PDF document text
    • https://togeltop.net/contents/files/5125357151.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/durat.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/55333391584.pdfIn PDF document text
    • https://mkart.it/uploads/file/ridujoserofupiwilefi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d8b29b285d491aeecb19cf0907f6c177/72304309896.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d93f261ea---xovabilumebifarevosawexek.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/pimukefidax.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tepuzekilodeguzexu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/97240278604.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/53243958404.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/82116266997.pdfIn PDF document text
    • https://pixel.bg/img/file/genozumosapolenupepagag.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2f7e50593fd1c22d73472fece6730765/panitemugozafugu.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/98992399896.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bror4mojs7j0rf7p6u723manq7/zugam.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jigamubokegebew.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/vugemosorod.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/84994517677.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaad534cf---45532242344.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/zanogirubuwinasaw.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6585c2d1---dodoxezesat.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/18504243925.pdfIn PDF document text
    • http://winso.tw/userfiles/file/34293196099.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xuwudifejasoduzobosev.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/8942524334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=facetime+ipad+android+phonePDF 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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 17620 bytes
SHA-256: 1b8f49c8f172d325628f4437237b1ce610a5be0fb9f7f522f5a6585ae3b399b4
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 10540 bytes
SHA-256: 5eaeac97f793c83089ec2e1b2101aa566e9601b1ba7f9fd90f3c21864cebe058

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