Malicious PDF — malware analysis report

Static analysis result for SHA-256 878b8c8bbfd318b7…

MALICIOUS

PDF

90.5 KB Created: 2021-07-13 22:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86673eac788e7ee28a45571a36539781 SHA-1: d4c5118141d74c55ffdcfa18ca095e36809b5658 SHA-256: 878b8c8bbfd318b7738d5bf8e2848ef7b326ea480e0a473d2a187c5850b746e2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute a second-stage payload. The presence of algorithmically generated URLs further supports this phishing and malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://short-story.ru/upload/file/61510692282.pdf
    • http://zartmobilia.com/userfiles/file/20210608050654.pdf
    • http://51-lq.com/userfiles/file///zakabezokolunitus.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0430f569b7---majopiboloxoriban.pdf
    • http://doo-san.com/userfiles/file/20210519212845.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c5808d8bd00ad56c22ea5402986d3950/fukafinipepevasomedov.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe6769e30---domitemusiwojanatoves.pdf
    • https://alyansdugunsalonu.com/userfiles/files/97413719953.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/96ce4cps9vuuf6dpegren9a62j/tonitapubonusub.pdf
    • https://a2designbg.com/userfiles/file/31832410990.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/67973765926.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6321dcc45a3611c595ba5b578d7c9a6c/lefogixutakezu.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/912b520f7f1d61da6d75ad7796c7ec42/78825032033.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sa7qaaqkraau9cv8dljs98pe65/61751132875.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf69a2e66---23515437321.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2103c981252a29bf54bcd442409c206/meluvajexalixufunufajiwo.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/10050967144.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081352c581fd---91411486513.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f225a9c4cc01a0a2bf5fa86ba60186b6/21837940941.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8394bff70ae146b1d421a62f2f4dbcf8/zidonitomafaw.pdf
    • http://vako.vn/app/webroot/uploads/files/zenaro.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d900c477---fewiw.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/latigodinuxonaxunujokak.pdf
    • http://easyreturn.store/userfiles/file/29497955555.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=staph+hominis+bacteremia+treatment
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e957.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16792 bytes
font_01_sfnt_off0001016e.bin
f1e09822ec895441f447e12d78a5ae284a950681f16036e24aee0ae10cde7791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 10808 bytes
font_02_sfnt_off000119e4.bin
98dce13ea82958d335caca40c11ef2bf5667bc16f846ddb7699689667abe8c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 17160 bytes
font_03_sfnt_off000146e8.bin
e6aedca6baa4f52dce5402eb6cae42210c59d09bb580fac165c54b04f8c67907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146E8 16152 bytes

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