Malicious PDF — malware analysis report

Static analysis result for SHA-256 a606c0079e491f15…

MALICIOUS

PDF

91.2 KB Created: 2021-07-22 14:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae7730f689f41ede7fa87b1922d64790 SHA-1: 3ddedc82825dcb2fafd4830b9ecf15a2eef90dbc SHA-256: a606c0079e491f15cf159c304e3a4f2ec3e20cd19c7715726cdac2ebd9fab534
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to distribute a payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://mattress-leader.com/media/dojejamavefimagur.pdf
    • http://brnc85.com/clients/878796/File/5143192967.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bf6dad75e---35916189167.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a3f1b0521---nigosapasofosi.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5e2d406e---32553961802.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608927b01506b---80555181187.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c609ca90ee6---43953303092.pdf
    • http://bannhuaduong.net/upload/files/23241774539.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c1afd0c4487dcfb48ea0a89f4b9e553c/25418580515.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/60613344814.pdf
    • http://drironcat.com/images/file/zepiluparabano.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/870d6bcface521856ff74fa3b3ea2299/pesinaxim.pdf
    • http://nandeestationery.com/userfiles/files/6089137609.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8um06mtn2bckebk8okjicpl6cn/85028966576.pdf
    • http://lab4050.com/upload/editor/file/manusixufujomikomo.pdf
    • http://ekotop.eu/userfiles/file/xikitekorelanubup.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-24/20210624115030727263.pdf
    • http://nuitsdartistes.eu/images/file/peluvajaserujupiwifag.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b7409f03---beduzobagofu.pdf
    • https://hotel-la-licorne.fr/userfiles/file/69879571355.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f71aa33e3---74597997425.pdf
    • http://yuha.be/_files/file/45871362021.pdf
    • https://2acontractor.it/images/file/zunuwediterorowexepizi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=west+african+music+history
    • 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_off00010236.bin
afaada66572c1a30d50398ad137adf05cafdf9505b65e94d2330599ee160128d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 17368 bytes
font_01_sfnt_off00012f5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes
font_02_sfnt_off00014776.bin
ebd45dbb814ab6cbf1ca58fa5404a5104733fb584220222eb80cb20570157fa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14776 10760 bytes