Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85b0ee587c6d5bf…

MALICIOUS

PDF

108.4 KB Created: 2021-06-27 10:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fdf34b7986a9b31f9658bd94bbd1695 SHA-1: e713ccb0a715d854e80c34926f2ba3d9f80a469b SHA-256: c85b0ee587c6d5bffa3ecd360e4cbd8d17aec739f5f7735159ac9dbadf26a3ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072a33000984---wojewujozekenosigoses.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160915ef60dcde---25296857683.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/229286df7d73f47902637dfc30af6408/lusatomojadudiba.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4681d15d---vemokakewe.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65a4306c6---lawikewik.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f3033669313a0549994bade9c5d969c4/71462130796.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/jamizobojufomonalofadarew.pdf
    • https://szekszardportal.hu/userfiles/file/51703276452.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5f440bf10847664c35943eb9e0207b05/99034207480.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d51c5e28686---36246494635.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67eb6c8a9a---22521927206.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1c2b493b---bepifixasutelum.pdf
    • http://chandigarhdatarecovery.com/files/file/vuratijaxutasife.pdf
    • https://my-natural-style.net/upload/files/migek.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e6478335---54488505619.pdf
    • https://healthmatters.me/userfiles/file/38528716633.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/88v1dcnc7fttafv84f31hdh972/rupuzesivukenuxa.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/viboxebubefiv.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843a61c9b8---54937461378.pdf
    • http://alimentosldm.com/userfiles/file/pivejab.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/zinilisedipuruberakedapar.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9967404fa9a013a01710763e7ae1bce8/94326526916.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e202711cc5---5281106905.pdf
    • https://ferado.vn/userfiles/file/lisusavugetosudugo.pdf
    • https://securitydm.com/slicice/file/desusexemokimusadapeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=iparty+full+episode
    • 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_off000136f4.bin
50c55cd80853e7bbc9917fe8bd1813502d3262c08cb292a1bd68e32a0192ddfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F4 2372 bytes
font_01_sfnt_off00014156.bin
6001b0dfd7d87aeba26e8f760490118a07c748af436cc27268b24a31a9e5351e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 18996 bytes
font_02_sfnt_off0001736b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1736B 16792 bytes
font_03_sfnt_off00018b82.bin
54f65c7212a0df673ab6ac297db7e0f7d39ee0cee2892dca228f43886d04b8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B82 10552 bytes