Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39689abfb4919b8…

MALICIOUS

PDF

81.9 KB Created: 2021-06-27 15:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 381a2c74398fc9606b8e16ad1578748a SHA-1: 48d0b53b2f2c5184f272a3ab3c14e874b164c274 SHA-256: b39689abfb4919b849c5ab43f20e8f479e3a45753e5c31b83e8769710a0c45e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2a10fc80---pemixofedadujuwubuvu.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/211jq6b07qqo3hfln94d7sbi66/30973723312.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f6b81fe1---wapisopavufetaxo.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/144f4a8790ee856cf919ef37af65cf6a/lanufavijosutelepaguravox.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609218cedb28a---9905750094.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oms3t2v8ln972io1v6s2odkn15/fosiwubetajuvosuk.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eaa644682---suwuluwotepu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a481b2efafe---suminovaxawuxoxe.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d49bbf6b8eae3dbd824a0dba2dd9eae/lanaselubonuv.pdf
    • https://adepotcustom.com/UploadFiles/file/20210503143358143.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607990e4447af---20556335900.pdf
    • https://menu2uplus.com/images/file/dotipowafop.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/86512441125.pdf
    • https://nslogisticservice.com/userfiles/files/duxigonivimapug.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c84ae7e2dcf9902cc518fbef0ecfc7c1/75806780386.pdf
    • http://rauvuonsach.com/images/uploads/files/37392282898.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/79d00cd25d32d170a7aa4dff298192ea/56690833386.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0fmqacssr0kkrrbrhabvdbaei1/68878112168.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e399516e54f8498500311bbbcb1311c8/gutabevavekuzumijijebeta.pdf
    • http://alexhofford.com/temp/files/file/zonepi.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4eb361557---41463013920.pdf
    • https://coolinterier.sk/upload/files/59434390231.pdf
    • https://flardochform.se/userfiles/file/75465054585.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2a1fc3017---sumuvek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+channel+app+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df76.bin
405aa2b1ceff2ef1d69fb8679b259eebe780c3ab996f179b606da35ad015249c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 10316 bytes
font_01_sfnt_off0000f6a4.bin
b697303a4a5892f4d0e8931a64c2020832a833b171aac4bc1404bf0a2badfa94
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 16808 bytes
font_02_sfnt_off00012243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 16792 bytes