Malicious PDF — malware analysis report

Static analysis result for SHA-256 0608c9e5f55f57bf…

MALICIOUS

PDF

88.3 KB Created: 2021-07-07 20:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7650914d36fa4aaa1c2cc337f24c991 SHA-1: 0cf1f754c472a48788398fc6402ef24391ea923a SHA-256: 0608c9e5f55f57bfadcb8d5ce38a29050873689f7b0e4725ae1cdc6d1b93a5c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=introduction+to+analytical+chemistry+class+11+exercise+solutions PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ftad98spg0ca3t2fu2j6kfekk1/18188249749.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8060495ef15c1ea97460f4f23efc23bf/35344241946.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/068c7785f15cbae7f07f1cc6a9e62115/larafidoxewaka.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e20112b80---96983388188.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949d0adb13b---judife.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h4qk2vp1eu9ljr1j17lgm112gb/58463669768.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/kakaxowosekoxabaviwon.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/rafefepa.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zebelilejaforonibeb.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/6896662385.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf124cfc7---folikipedisa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609202eda16d9---25225303069.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64c8c292583c464cd882161678fea4e/34496694749.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9ef698cc---wizizadipovudamo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/44783416510.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9edcdbd879---doxadosatazix.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070144c690e8---fugomeluwopigawala.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/17173208d8cfbe6d131e14f10292211a/29576934008.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb7d0f36---xafugubinibabal.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/20397158709.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608601d434c6d---bofibizu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94734a6fc---zozolorezixewidifaxurala.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/xawenam.pdfIn PDF document text
    • http://bscartridge.com/pic/mabevizizefabuz.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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10956 bytes
SHA-256: 48b3af294bf191381cccc62d1cbad8f39831f9ae327025ca19e2ff116b1dcf7e
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 17320 bytes
SHA-256: dc459099ba69f5052b0abff9477256485139b39fe3b8b5da9282da62abd57bc2
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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