Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9278c61210dfa1…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 03:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43023a2fc2eb515886e27d5db79356bb SHA-1: d48307b3a0dec085567e603155ab8c44df0d28da SHA-256: de9278c61210dfa153ecf3af53a1c5a9ff054cbb6e36ccec56253fe12cdd2600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

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://allytemp.ru/uplcv?utm_term=scrip+meaning+in+share+market
    • https://unitjaya.com/contents//files/fizivopajawabepovabumif.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/wilotu.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee5921836---kobejotinedeweveropuve.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qr47njro6s2hj5i6t0hh04h7b2/xigisepoxidixisekoxigi.pdf
    • https://acgroupenterprise.com/userfiles/file/21226677697.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb3aed7f0---87325799432.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b751258a3a---raxigexeja.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c11dbe43a---29241221944.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076927165da2---zetoj.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a47047c02---welujogetinurizemumoj.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/8j19msgh4k32ae27n5os0334f0/xogumabefep.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1aff33a1a---jemaxalumejuboj.pdf
    • http://tamker.hu/userfiles/file/97958743478.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a064709b60b---4005997786.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/70b41a629d1e78e322c7954640c887df/gazexogezasimilorap.pdf
    • http://cassotech.nl/site/data/ws/files/89385560726.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a359ac1fb9ed51d41499bf509b4c369e/sumib.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/pujuvavajesale.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8dc1481e6fde8e32e556d9344efbe84b/lanesezavedoluwazoje.pdf
    • http://stasta.com/userfiles/file/fuwimigilabol.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb71b4d27b---xojeratofadowiwomurujafon.pdf
    • http://rauvuonsach.net/images/uploads/files/61853885834.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f260b228b0deacaec8cf072a8923b808/10724797981.pdf
    • http://nadiadsa.org/userfiles/file/81116001182.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_off0000fed0.bin
2b75d506e4cbae0666df4dd0f6d42c74b12f139a64f4c858181d478ba1869c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10824 bytes
font_01_sfnt_off00011796.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 16792 bytes
font_02_sfnt_off00012fa8.bin
cc353c5cacc4b29b278455d161bacb1ab22208cc988e2de9aabe299baa40eb3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 21428 bytes

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