Malicious PDF — malware analysis report

Static analysis result for SHA-256 813f0bcbb45702e9…

MALICIOUS

PDF

111.7 KB Created: 2021-06-30 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c79d28765abd7d3f6e7e9224a8e40d1 SHA-1: 24a0ca6c21768ff673d925287431164a0c02dfdb SHA-256: 813f0bcbb45702e93a0ed22f4802958ffe1b02266dc3594f61b5bd6a299888ac
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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 http://hum-lucknow.org/test/fckeditor/file/verade.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/17a9296813ed22c921efb3669c08a264/runimikeselemuwevupir.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614c358dc0---26456626599.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16088400dd939f---majojonejevemopar.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/34998697310.pdf
    • https://sunarchegypt.com/userfiles/file/14899897318.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/73804998341.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/vojazoni.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/85ea18b8bb8c13fd02750b804b3403e7/korewiredazilipoxob.pdf
    • https://zlatartopalovic.rs//files/32939992213.pdf
    • http://www.urbanwaterways.info/files/81911844605.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082061c8f943---67001683028.pdf
    • https://sjalikave.hu/pictures/file/ragamewuwegu.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fd243309---92354301359.pdf
    • http://schodylux.pl/userfiles/file/98762329643.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aff68f9a976---rudikuwafinezeg.pdf
    • http://staresecurity.com/userfiles/file/womowejurazeginunaneb.pdf
    • https://seerupit.dk/assens/file/12266406091.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/kitesiruzeke.pdf
    • http://kirakuramen.com/uploads/files/40897026964.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/44f115c0ed770840c126829c8f6025b7/kamuti.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608738be1de7a---28805896658.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d84a1466935650d876b17b1ba95a699/xadud.pdf
    • http://asiavent.com/UserFiles/file///88605287408.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70d3f1a43---14067304804.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/6af162392295ded544e4cfbea279e152/kijebomolixobegagarapok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=boxer+cross+puppies+for+sale+near+me
    • 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_off00013448.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
font_01_sfnt_off00014c59.bin
10bd234ff2667c1801632d4d0b1948b967c3bb1b6d342e7d5aee6f0caaff1d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C59 16236 bytes
font_02_sfnt_off00016229.bin
5ad950ad5293ac9c57297f9d9e38097bdec81b2658ea8f7f63d5e65e9fec86e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x16229 10796 bytes
font_03_sfnt_off00017b0a.bin
850b56f322375d51cc30255f22bab7e7bf44ae81b3c72f81dac23ad547c66225
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B0A 20556 bytes