Malicious PDF — malware analysis report

Static analysis result for SHA-256 856929e025924ef5…

MALICIOUS

PDF

113.2 KB Created: 2021-07-17 01:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43e91bad841673e8243f20e2ea6f6d45 SHA-1: e8a11f13a99b3bc6f9165c4f04ea802cec33bd59 SHA-256: 856929e025924ef5cf6983b2f697450c7b7a124a3c7c151aa8b022f660c31c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40354844d1---takisow.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/f00klpbulo1kn493aqckrf241c/60155333063.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c774f9d71c---54937417187.pdf
    • https://mytekas.com/UserFiles/file/52938017922.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f97fe12f616991fbb1bc7a69e188cb9f/mijokebalilezasivafowizo.pdf
    • http://dzwigipoznan.pl/userfiles/file/sojadekutevudajapemafuw.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c3a93c3adfab4e19543c66bd3e4d03f8/21876342243.pdf
    • https://aromamarketing.md/img/files/sufifu.pdf
    • http://paillasse.hu/userfiles/file/fukenalineluxexefoguzu.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/541ftoud3po2c4lh5itt2idln3/wojulaxodebawusopiwapul.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2e0ebe2211adc4f29f38fa391fb7553f/3830697582.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/pavokudubifeg.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081831d887da---3272430908.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7fece617a5910921a7fc595e8d999766/dalelamopujoji.pdf
    • http://dgjst.com/upfile/file/89354395202.pdf
    • http://planetamama.ru/files/file/kavoxexotafitar.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/pp7925ig16meae5jsbc4uknvc6/44160465857.pdf
    • http://rheumatology.institute/upload/content/file/79481585448.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/53925999bde1df26af64b3cc755a7e52/xabevo.pdf
    • https://whiteplacard.com/UserFiles/file/dajawonuloj.pdf
    • http://filtrydokoparek.pl/img/all/rugesotevowegi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92227f43270f0207bd5dfffe27d6be52/nizeropokabazisoj.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7a1e5dbcb---39897927414.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/095c0df56d3396102511a59f5afd4410/susojupexajowop.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d5cc364b945520a27416534f8e6f9330/69788444394.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=quadrilateral+real+life+examples
    • 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_off00013849.bin
6489e646d18458765199a57be55f1b03d5d70d63443aaaa6399edf5f717c03ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 16220 bytes
font_01_sfnt_off00014e06.bin
874ab01e0b99c96c61cdead50ffc7ec2af745b3b45ad712a4aedab9f451156d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 10696 bytes
font_02_sfnt_off000166a6.bin
7fd6a5e6ec6ca4f62ad62eb0a2b52ab117bd4da1f57050c8b8536998683f9218
pdf-font-stream PDF embedded font (sfnt) at offset 0x166A6 20788 bytes
font_03_sfnt_off00019eb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB0 16792 bytes