Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c8eacd94926b5c…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d886b22a1620b12985dcbb35c8a670e4 SHA-1: 884c0a3fb505a73540d11eee65d2d0d58d8f9ba9 SHA-256: e2c8eacd94926b5ce6be87a1211d8ddb967cb61c8d188df317b21eeac9ff86e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fed4a1aa6---93216776656.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/62a136f02cc4a610bfdc5639813cd45b/xetodel.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608780f3cf664---ferisafu.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a3887235---8388238454.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/sunufo.pdf
    • http://khyljg.com/uploadfiles/files/jutikoburegolakamir.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7b498f32---dimigafawokazifenebazip.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/cb83edba719dd1b33fd1686d4a9f92fe/58302521841.pdf
    • http://apsons.eu/files/file/5148598185.pdf
    • http://ownlines.com/upfiles/file/lumikoxumopapa.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/482230a394757c503835aed2db3e4815/peraxuf.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5f9c44a7---85902757474.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pahc22kmqk853r4blq7o573715/63735606816.pdf
    • http://sun-green.be/ckfinder/userfiles/files/35545771766.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074542a758e9---52373239168.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16073ebac248f7---kivoriwaguvewevadijivoxav.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8889d7d0---kubez.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/93e18cce5db0cdf0cb93103b2f03332a/difijogazekux.pdf
    • http://ucity69.com/clients/861769/File/48293615639.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f0bfbk93r3552he7es1n3t6ft1/lurut.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/11303438559.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0294064d2---86338484113.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160703e89472cb---36028529052.pdf
    • http://polimak.pl/userfiles/file/15406241861.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87a8611afe---56571356355.pdf
    • http://biomassasia.net/data_ed/userfiles/file/jagulinum.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a46988dad8a84d7e54f84a22b8950a55/xokakuwujukudupiwopanoba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=compliments+that+start+with+e
    • 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_off0000fe83.bin
e4bcbf475e9970c6f45c4fbbf3b69729a16fd7d6fde855551f36ee857e7d5ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 10636 bytes
font_01_sfnt_off000116b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16792 bytes
font_02_sfnt_off00012ec4.bin
e468bb8cab421df7476d8187ada3c3dcba5a71cdd5f2cc8c2bf3fd7b7252a645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 18692 bytes

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