Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ac43c4e4006fa1…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 07:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c304e126644b09daf81f85be7620a286 SHA-1: 23a2bc8805b6ed63e8a488c2079b29f32b260cf6 SHA-256: a8ac43c4e4006fa18c56c5440320e88125bc4a35ae974696841908a9d5680edb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to further malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true destination and leverage vulnerable web infrastructure.

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844fc4d3950---moxevonapusibikamugopin.pdf In PDF document text
    • http://trendybiz.in/usersfiles/file/38451407474.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec00b9b4fa---gitutadajapotinazobip.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pimes.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/10712431834.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b3484ba6---13432366410.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f08e9cea9c98456e968b7d2504bba5ea/47769133366.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a6f28417---40734359115.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d27b16e984f76ea38067f7f0cc14e887/92114933909.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/91bba43b4ad9e7f00fb98d015aa554d5/jolinezedexor.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/009889bea89c118276599d9f2c775083/95476395904.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lt95ajblktb2hqvth4rd4l6vp6/kigotogolotizosejetagu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/df4fpm17prru0jbv80bj7mv9s1/3545024563.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210610104320544023a33wyl.pdfIn PDF document text
    • http://dzbnf.com/upload/file///23920381661.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/pirotiruvegufup.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1927dc3bad318135c5b637057283afb1/sasosivowujip.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1455761b2d---98577930293.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/68610058189.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/20ae6c46309c5080e3422796a4c59109/mamolarimebojuputepoloza.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210625061440_yfm6mu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68322cbacc---34279608653.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c486969510---20599614282.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f5d8fdc8ea0c92e2108349bdcf9a50f3/wepaforadurepaletav.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wasujevuge.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819083e7e1d---34231976819.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c250a095df8---vubumirisonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=there%27s+power+in+the+name+of+jesus+mp3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 18224 bytes
SHA-256: 70cf853f21e7f8b1ea6ffd34cb5e96ad088cf17b77426437b93c058d12b7e2fd
font_01_sfnt_off00013d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D78 11064 bytes
SHA-256: 676b47bbef363fbed7f12bebe716f9bfdd7922aec1eabd1361b7388e344d6786
font_02_sfnt_off0001572c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1