Malicious PDF — malware analysis report

Static analysis result for SHA-256 a867a7e2f5fcd24e…

MALICIOUS

PDF

104.6 KB Created: 2021-06-28 04:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e51b5f85b1fd4554760593059c78b1b0 SHA-1: 70404a584d0ebcd362ed8657a321dc64cfd8d8e5 SHA-256: a867a7e2f5fcd24ed14dd6ec51cf92e4b7c22d543a6ffcf98b37312dcb08a820
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609612225f378---30701771933.pdf In PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cae536c4e7e4bb2c18ba294caeac7211/wetitotefivumawebujek.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/47655440323.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/funoburo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/49f4d23465084e7b954cbf7d1dc08eda/midagidonedubizexuzinoke.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/dobubixoginadefudok.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/58b30ac7fbaf5a7d0ebd6846e09a1840/68776799819.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef074b8a42---93675654750.pdfIn PDF document text
    • http://lucann.com/Upload/file/5126945268.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232cd44624---dasowezufawe.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/sapijisosojederevibi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vqqt82884anvus9a8qdlr1ootj/30151590257.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e829863c8f---27086829489.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607697ab82508---19574489966.pdfIn PDF document text
    • http://emannsltd.com/userfiles/manilarewepaburigolifeliz.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c377c540---zefibojofaxokavabona.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e4f13b0c---pekokavapup.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/15245218124.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6e90dc989---jozesepaxugorewa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f05ecfeb6---romirereseriburutunajeba.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41d67e876---33335150280.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821ebac60d3---keserubazaluxitadutonufef.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b71594b95---94049110099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+farm+midwivesPDF 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_off00013681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E98 10368 bytes
SHA-256: e4a8be66bfe0b12a7839d49211dc7dcac5e90eac7094032b989b3511ae00aaae
font_02_sfnt_off0001660e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660E 17848 bytes
SHA-256: c282e29177869b276c958d1f83e988a3768d2bf960692f83b0f38f7a92fffe3f

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