Malicious PDF — malware analysis report

Static analysis result for SHA-256 1919fae1a16feebf…

MALICIOUS

PDF

80.2 KB Created: 2021-06-23 06:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 922a6213b1437f78c8ccdb4778270c12 SHA-1: 80cdb8a7b3e1c3d2c14efd0969c081b798f6e55c SHA-256: 1919fae1a16feebf86ab4c4a9b4eab975e729165f65a8e0cd0d921653089e2a8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting multiple PDF files on compromised WordPress sites. These links likely serve as redirects to further malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b004603a16c---22085776740.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1a0929fd---7329300020.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/julntnc9rp5q7423kiorjmg505/93176585210.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca3a35690---wazubijalirilisabebiz.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbac8281b9c---zototu.pdf
    • https://e-uchebnici.com/img/file/guwujulu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/18ruo25eithjjk33g8de7h4fmb/niwivuwa.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09abc23e6---fowujixikaraxudazisojukir.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5f1c39e7dc6266bbd30d77612aca0dfe/pifebodotiz.pdf
    • http://elmbbq.com/uploads/files/turarikaloxadunenulanal.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609834d889c5a---zurogunuwer.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224c1437b0---logukazujaxexepuxopuba.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5b742b3d---67202962178.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784f2705ed8---bawovavuge.pdf
    • https://betenrealestate.com/sites/default/files/file/talavodobavotabasuxozi.pdf
    • https://bosgo.mn/uploads/files/14232798187.pdf
    • https://badrivishal.com/media/jaxabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stem+education+in+zimbabwe+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8a.bin
eed59fd08c838412b9ffd9f6e28850ad008eb008ec076ee446c15c70bd7c5ece
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5264 bytes
font_01_sfnt_off00010173.bin
3e0a7a57043b2ac3fb5f62c05624c874e3a1f039a668488e4c30b631e0f54fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10532 bytes
font_02_sfnt_off00012564.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 4324 bytes