Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f5f3256f6a7c9a…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 16:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fffe3ed8da05d712a296b4ce7e368d4 SHA-1: c0eb0b543e36f708f6f7179ee58e20ae430203ec SHA-256: d3f5f3256f6a7c9ac381bcfc7cb048aa480a88bacd79d1e3b7495c38b363df39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://foto-preiss.at/upload_files/files/wododekizafike.pdf
    • http://fatamorgana.fr/uploads/assets/file/82715854367.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f44c2b52---tubemutagapizoloxukes.pdf
    • http://smclassof57.org/clients/34860/File/5325480087.pdf
    • http://terezmisszio.eu/files/file/60183398519.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3af82bed0d1a57b7afc676c1ea9f632a/41973070042.pdf
    • https://myclubowners.com/userfiles/files/zururimapiritemilosev.pdf
    • https://weeb.nu/userfiles/file/lidipodipas.pdf
    • http://elitaliaweb.it/upload/file/purudanaduxovazokapol.pdf
    • http://jnafarms.com/clients/864068/File/jupemuzera.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/latonovib.pdf
    • http://buergerforum-tirol.at/file/rosolemijavufiwiv.pdf
    • http://sterenstein.ru/userfiles/file/98118059390.pdf
    • http://geteffective.biz/uploadfiles/file/298364444.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/36894685584.pdf
    • http://banlinhkienlaptop.com/userfiles/file/26764742479.pdf
    • https://weddingitaly.jp/images/file/bemite.pdf
    • http://zjqzzx.com/uploadfile/file/2021062810130473499.pdf
    • http://kfnmdg.com/upfolder/e/files/20210604141247.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160937fd83ec18---vokakagegevorexip.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6ec1c003b---dolomuf.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/05dbc8308eeabd98510c0fe22303891c/30769983177.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/789r2r3pie44foir4nlip3g7mr/87267485282.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=40+by+40+multiplication+chart
    • 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_off0000d940.bin
3897544ab0b6870ce6999bfa9311bda0c57e8427f72eba62dc01cdef3f68250c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 17268 bytes
font_01_sfnt_off00010694.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 16792 bytes
font_02_sfnt_off00011eab.bin
58216e59d1ad47da5f0c35529669453fcba86aad17af27eb85ab088bf3ef09bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 10796 bytes
font_03_sfnt_off0001370c.bin
94ada888842219b54f0bff61c05754c95ee5bc28b4560123b174b2ad5ef12220
pdf-font-stream PDF embedded font (sfnt) at offset 0x1370C 16144 bytes