Malicious PDF — malware analysis report

Static analysis result for SHA-256 babc2fc3f6fa19fc…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 23:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b9fbab0e8bdb1f84841140fa449af22 SHA-1: b4473a3ee1a53ae0a7449fd19a624c4a2401c561 SHA-256: babc2fc3f6fa19fc14ef9624d26395e98bf40375dc0476db3a29fcd4f4c609c7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cdd966b5---belajexitol.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c234c4ee7ba---3079337062.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076147d6743d---pajimopemip.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/nsmv7417cf24e3fc1darumksje/xerugoretubodow.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tj01h62pq652i8grn69te6gl81/11329397913.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078166933409---sutuselupusabetob.pdf
    • https://suma.ca/upload/editor/file/71230737572.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd1b4c0d7---kebuxuvelujapupudu.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6d76d8ff2656c0aa629820006c725748/3087030484.pdf
    • https://thietbivesinhanhhuy.com/asset/files/volupetusokejuximonesiwu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/dcb48c9117eddfe85e3db637c9550fe5/42341243572.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1a30e7404102de4a406ee79972f087a5/dotosis.pdf
    • http://candientushinko.com/images/file/rejaxedejef.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0iep9vegiis4tjaogk27hkorr7/watadiwatiguv.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607114c8007b1---rinogudatanitofetumutufi.pdf
    • http://cepsagibyachtfuels.com/images/photos/zuzudorilexerigazolijew.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/46ad049e5f5ea21aee3e6bbf4ab0b938/64753847957.pdf
    • http://kme-kme.cz/files/file/84267152740.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f53cf06dff0d904d05b5ad6be9aea54/98156580118.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641898441f---newoboka.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/462b025f6e70522c4ea482e50ab4a882/fomiwezagam.pdf
    • http://bhs1966maui.com/clients/64750/File/68164249373.pdf
    • http://absigorta.come/file/najadabosofiniweg.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e68ccb4a---dopimivun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+of+full+stop+and+comma
    • 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_off0000f2a6.bin
029fc0690a2c5f80f13bdf0f6dd0fb78d3972b846ec3675d898bd7310b8f93ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10696 bytes
font_01_sfnt_off00010b40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
font_02_sfnt_off00012352.bin
d65e921fd17bafe92f958cd0b1af0a16c6f258cde7f2945b3be2a332a95006cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 17700 bytes

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