Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e54d96d554ef808…

MALICIOUS

PDF

114.2 KB Created: 2021-07-22 15:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61cf43b3a0260ed4cc54828345a50267 SHA-1: 97bd4fe9a7cbe397947273291dc9194d5f6d8e8a SHA-256: 2e54d96d554ef808c15ef97f0eb97d9139c1a83bb9b2e8cafdd67a13dbedab85
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b07a33cd8f7819920a4d49537346370d/56884111447.pdf
    • http://karinameal.ru/imgdish/files/gemuvajejupa.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/gajawudulajegoviwoza.pdf
    • http://ilyxrace.com/userfiles/files/porupuzaz.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6hds9djti8121iihtu5576d144/18985408503.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104bd666a4---pesugukixaxupowol.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8165e3a7---laxorususepesi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a8060570eb25738dacbefa2c418a6aa3/32562425927.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ec240590---92294377485.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1445450219---wisebuwixakimugadun.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7eceb5e62---boxajojus.pdf
    • https://photojet.bg/userfiles/file/912879075.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51061cc83d---rawujo.pdf
    • http://domusanna.it/userfiles/files/sojutepuwusifefisazono.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/86b315fe86457a69fa74bed22018e77a/fuwoxi.pdf
    • http://haciogullari.com/depo/sayfaresim/file/kejokibipuraxez.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/521db8ea71429ce6a59c6bbd33925771/52467619891.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fb8f118b99d6ad9170e3a2791e84cb12/70390879377.pdf
    • https://picinterior.com/ckfinder/userfiles/files/63318778472.pdf
    • http://mobiliteit.nu/files/48056017702.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd21d9697---15926646359.pdf
    • http://muaah.ca/userfiles/files/titupagolekedeseku.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/26654964708.pdf
    • http://brixtontaxi.com/survey/userfiles/files/14397490386.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=an+applied+guide+to+process+and+plant+design+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://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_off000157fa.bin
8a4d80e708f9c7ce4584a1e8064b5c8cc7589fc1d9bb60294d3ea1f970d9f2df
pdf-font-stream PDF embedded font (sfnt) at offset 0x157FA 10876 bytes
font_01_sfnt_off00017107.bin
733746b22b0a51fec9d32c2b591600c1ac239b690b38a7e4323da19400385254
pdf-font-stream PDF embedded font (sfnt) at offset 0x17107 18724 bytes
font_02_sfnt_off0001a1df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1DF 16792 bytes