Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d9e0288d9b2b90…

MALICIOUS

PDF

96.2 KB Created: 2021-06-25 23:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19af7aa6f4b96d7f2c1761256c6fa6ff SHA-1: 2120b2810ff60a34cee3ebc94aea317f2d02898d SHA-256: a1d9e0288d9b2b90e256c33222d26bdf2b94341a3581e4ab06b4a8a7950001e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://catamma.ru/uplcv?utm_term=have+a+hint PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf260290c---28588171417.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799b7a77c11---xerale.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609977f8a5323---tajakorimetipijikoveze.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/39891096237.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/376f81128f9b8e19daad7b259d791a04/63851034374.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/62239482706.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bb21031b4---pididuwigevurobe.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/21f6b091be795209abe5f05ce8efdea1/19778964797.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c746cc5690c---11103245685.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/luwujunelubexobemiliguwo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942bbb680fe---47152997705.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe915caba1---gadikozozexipofugi.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/29433824716.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2fdepf1qaqcndouh5pap6cd3j6/95922669876.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf51d2ddd3---88006109131.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ee60ebd2135a31d756a115bdd9539cbd/wobivesejoko.pdfIn PDF document text
    • http://vejwun.cz/images/kanusej.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/itpquv8h749va2dqp2t9d19tf6/wamugejivupaluza.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609440f28b426---63798676397.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/72172643041.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/77777947618.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4bee3128---bavabixedakorotokip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21227cb26---94141912597.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a725d00672---wusopojazivedesuxiwupuzal.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5329b57f---90700619081.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082bdab3ffde---zidipefir.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_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 17652 bytes
SHA-256: 9588183015bdb1b29c3bdee7f997de477a46d795aef41a04d4c72a2a60fa6fe7
font_01_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E66 9828 bytes
SHA-256: a503e072b2b4ec3234003bcbc053c94d5ec4a9daf8381ba2f158bf9090391afc

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