Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c91ba3297bd4c69…

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 12:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08aa604697bc10db63d0321c7f36e1ce SHA-1: 949d3328faeed59cb2ccaac6a1e867bedb5f2c3e SHA-256: 7c91ba3297bd4c696460cab08d49fb4b2cfe5eadcf8d64c42363ac2f838eb74c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.salpasafarit.fi/tiedostot/files/25529901000.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969ec2128aa---38729706778.pdf
    • http://ahkjt.com/upfile/file/xizemokatuz.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d72ec52a2d5---panigaxekiloxejanotigemo.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c35f6d586---dajugix.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2baedec7bc---manojetovubovagojurelaror.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b039df4da46---zawulifiduwir.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/577cef8bae8ed7c6e1e8691d5f8ac3c5/6637991773.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b763254d---mapexopurojetuj.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/94e30c5120e2e95dd8c0ffe61b941665/newosekukilok.pdf
    • http://omonetach.pl/foto/ilustracje/file/91204725722.pdf
    • http://miracleschoolministries.com/survey/userfiles/files/wolojazesuzuxigojuxifufa.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/02a49c098a8c4bdecfad3936b986f5b1/xesoxojamiroxik.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae5ecd2f2132bc887110399dda8a2453/pifejixos.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d7dbd11e76e4bd54a7be75fbc85363db/66185167076.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jalonea4k5iu9v96mm3ufimat6/futojagotizus.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/fr497u84isvjqmmql23tf4knqv/74819507992.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a409879004c---segozuv.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/237a1cf6c3d99fffd95e2358094f97d6/bunuxujujinaxakaxikudeje.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/97015588702.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9a222c2de77ccfea60fa758c40c8a796/413644469.pdf
    • https://picinterior.com/ckfinder/userfiles/files/62835895033.pdf
    • http://micronforgacsolo.hu/UserFiles/file/somoluvi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=winrar+32+bit+download+for+pc
    • 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_off0000e9d4.bin
a3779fa1339defd4e17ed0ff7d46c6371ff4fcffd3a24449ef5a7c0d9f174d09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 17916 bytes
font_01_sfnt_off000118de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
font_02_sfnt_off000130f5.bin
cd760fe4a96a947bcb7b0f6ec5f043cc334534161b24330d5f49fb1765ab1e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 10824 bytes
font_03_sfnt_off000149e9.bin
626b7c8f39d92c15a08a3ca4bc52fbf6ba2648b461fd8ff24e7d9852eaf99fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 16068 bytes