Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c745d7d7c2d601b…

MALICIOUS

PDF

97.9 KB Created: 2021-06-28 02:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 371d430dcbda6319c5d8254a687ef1f2 SHA-1: ac2a85a3fd0d5a6d382c84210c38dc85d812d9f4 SHA-256: 7c745d7d7c2d601bdc76c38d080932b1b1d2b671ae19070f162a4a63e811da3b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://alibabashipping.com/userfiles/file/tadoxirusesu.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1da8d810---tuxobagebatatajemegejuxuk.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad28ac7df5---nilofobusumuve.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/47127385586.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ufe39hapkmufm37rjg858mjd60/81692202191.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7155a7449180db00a088bd2052186de/53699142591.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b3c5c0a50a71a627b0974c170bb06231/bulagejobawivoduxadave.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/h987q111t6d38sf7jpso738g04/99461199783.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04395977fa---tubarisakutomivawarigip.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qckf0g1runkeg3arnrfh4kgqe0/zalenogegu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb648379dd---16278828770.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b8a2da8f3128c2e233683ca10d523c82/posetut.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/pinuzovigit.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zebowuwaje.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wijevunela.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/81474768432.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/m72me9g46rhdmn3g8d6nn6i5h1/79304162989.pdfIn PDF document text
    • http://altinay-law.com/images/file/luvenuvegegobevizumujom.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607519775da9d---kunuwuvoragofironovatin.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c8fe9558dafafc6b4658d907d9c9816b/mafuli.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/89004ecb970af355455dbe6508719d8e/49563597671.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6eaa7aca693b78222fffc99fdde94349/totopofiruwivez.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba980a869e0---19878575999.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca848cbf2---nazuvagapipofobidig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=skyrim+lost+to+the+ages+puzzlePDF 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_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 11036 bytes
SHA-256: 078e1ec26c9e6ab9307949044d84936bed4869493f76f8b4cc95029dd6401817
font_02_sfnt_off00014bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF7 18184 bytes
SHA-256: 0567e66eeeb9d9f3c645ca44147898d91150b9ecf12427ed4bba917956547798

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