Malicious PDF — malware analysis report

Static analysis result for SHA-256 1021cd4c98e83815…

MALICIOUS

PDF

83.4 KB Created: 2021-08-22 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 470f1da9fa8b934770e215e49d552795 SHA-1: 48887f19b704703ae21a8da491fd6aa0f6dcfd76 SHA-256: 1021cd4c98e83815969bf838770341c3c790b020c5fc714221256596e88d2d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://sapientgenerator.ru/files/userfiles/files/2617634326.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec69090b7---lasegusuvemubuwi.pdf
    • http://bienbao.net/uploads/files/xujiboxerodizi.pdf
    • https://loyd.rs/images/file/geligatobenolijiz.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5ca145db8ce16918eb9b103d1af3b1a2/81094106245.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/75d4c32c7102dde5fbf00db6f25e602a/najizulojeja.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1be3ab4086c0352b336cef9fa7dbcde2/14281210481.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c21eacac5b6---rinojid.pdf
    • http://thamdinhgiadaiquang.com/img/files/37838201686.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1fff414a8c9b59dcbfeb16469166fb9c/wofogona.pdf
    • http://mya1fc.com/files/ckuploads/files/wawiki.pdf
    • https://groupunsur2.com/contents//files/jakupunipivagebuv.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcc9350915---bujoxokoda.pdf
    • http://aeronautike.com/userfiles/file/wuxemoponobusozusodipova.pdf
    • https://nhahangbienhaitien.com/uploads/files/21653627947.pdf
    • https://vatlieutaphu.com/upload/files/41439047687.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a37007d04---lazibekebe.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c13429131cd---pepewitejiraxob.pdf
    • https://mttrasportisrl.it/dati/upload/file/92430606770.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/41b975595624cbe66960521ec207a9bf/64327537925.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1eccc622a3b8907decc61e203db9dbde/lolugikijuzexeguvumape.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/mipovozubuneniv.pdf
    • http://hagelkonzept.de/userfiles/file/42431248971.pdf
    • http://fresh-j.info/images/uploadedimages/file/41197682429.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ejemplos+de+numeros+decimales+suma+resta+multiplicacion+y+division
    • http://s292376414.onlinehome.fr/datas/imgmail/file/87694478336.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df37.bin
4b1d7156a99bff0c4eb3a0691ac6f37589b56015b13ca76de8ecc4b6e5b14483
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 17752 bytes
font_01_sfnt_off00010c8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 16792 bytes
font_02_sfnt_off000124a1.bin
7eff3749478640f254b3e4d162aaeeace4e7b9506b79197f7a34e720f152ca7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 11068 bytes