Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fce03564bc5260…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 14:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 987bd71a34e343543b4e5cfdbcd32c71 SHA-1: 798040050e5054ea300f51d10ef876bc36db3fbf SHA-256: 41fce03564bc5260464420d9273253dc49f3ced98837d6c921594858e11da750
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links are consistent with a tactic to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

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://bancodevida.com/bancodevida/admin/images/image/file/74702910319.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efb5b6a1e---6325007624.pdf
    • http://tuzvedo.hu/elemek/file/53281304222.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/979fd74c5b7fa780fc48f874a9c33876/16436363524.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/j75d81dov41rusv44mvu0ahgje/17107547626.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hho9cnn5pr3bok7oedtvmam5ni/ketegozebinewijajugoxowoj.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b72f884b4---95317383838.pdf
    • http://leguido.net/files/44751885276.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/464edb00ln8if5nm0v115caprb/xorigone.pdf
    • http://www.odnpoznan.pl/fotki/file/file/65544024292.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30b2378e8---75987337992.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8ddc3bb249f0755bd1f6c63f8b4d5bd9/78694081973.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b35b7616c---kipited.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508183035678253.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c7eece6b6bd5ff7307206f844852e8bd/kuvaligudux.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pokjh7cuqua3v85t17k94ksf4r/21916235042.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdb95c06e---39641318913.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c8b352cd3708accdfd6412eda7cffe2d/21222576049.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dba2e2e60---pebaxufivok.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8c7afee47927392f819bd745b8043342/9893316203.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080226dad1d6---58274050246.pdf
    • http://infinivideo.hu/sites/infinivideo/files/47072489456.pdf
    • https://catbasailing.com/upload/fck/file/83278472805.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f926da00f2---bavebe.pdf
    • http://reguitti-engineering.it/userfiles/files/basofewuwexujobogivim.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/pedujudajuramorejepakaji.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b242b7f83b58ffd25dd88f932be3b45/33676832872.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=alluring+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac0.bin
27a9a1cf4d984abf4a292ec0b9b9b3fc1b81aa64c56944376c8a2d5ef1360c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 2808 bytes
font_01_sfnt_off0000e69e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 16792 bytes
font_02_sfnt_off0000feb5.bin
69dbc002619da0b315662dc9387bae81c41d040ce9954887c9b026276d3f76f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10420 bytes
font_03_sfnt_off00011603.bin
5a3ccff492c7dfe4acbbd1e8e3eaaf8829f9cb540d83106e9a4cdcb302cea856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 16656 bytes
font_04_sfnt_off00012d96.bin
0006e697253fed198c84ba995b0f432116adc15075087eb0a7ef286ae6fef256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 22864 bytes

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