Malicious PDF — malware analysis report

Static analysis result for SHA-256 80084a2cd998ace8…

MALICIOUS

PDF

88.9 KB Created: 2021-08-01 01:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cae9c8037d4f066a30f2508ca98a77c7 SHA-1: 640926cb9c101c02ff7d9703885a5a8d15b34c35 SHA-256: 80084a2cd998ace89fc8bda7b0690004f58a0472680f28a15ad9ac3334d67d1f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/73pu7ueeevkmidk8omcane7u5k/59635579425.pdf In PDF document text
    • http://libron.pl/fckupload/assets/file/gufasujo.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/zozumazenamanolozukidi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7a16857a918d89267337915b9889dc4e/36845711055.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8111de104d---zutotosujeworelumotuzazu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mawurifiganes.pdfIn PDF document text
    • http://aven.su/userfiles/file/65879461348.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02cc32eaf---fosevixonujusutulalonos.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hol33rvrb7sbovq2l3bmtdjr13/88314021204.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f4a4fcb3---muxowujazerod.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/jojujor.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8866f87fb4e7364e6818052ad971793f/99628782060.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/zedaxagano.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/92274982174.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/8326379790.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/44839043888.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a354f203b9---jawogesajajuv.pdfIn PDF document text
    • http://brlairport.com/images/file/29313209202.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/38557220108.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5a99f9d8---sogetivogosixesigefofe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b7c42c24---11311959477.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/xuvexugib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=night+mode+developer+options+android+9PDF 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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 18936 bytes
SHA-256: 450616fdbf191e299eb9fa8c330e7e45faa3133320ca6a8fa90dee3d04f4a1c5
font_02_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 11048 bytes
SHA-256: 99e45fd87dfd227f7f0aa2f3206cee057a5e4adbdb2bb5f908191d71356e3904

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