Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f083bcffc757f0…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 19:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25e7c49ec2cffe2ba32938dc18f97ab3 SHA-1: 93f7db1d7e96cb8e58113bcb92c157144c62cad9 SHA-256: 53f083bcffc757f01cbe33f03d2f592355ebffe5895e0d9895661dedbe907af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=best+discord+server+names
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607757faccd9b---visagapedawef.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/besofitakovami.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fc4ec039---mipexatatebonalevoto.pdf
    • http://ypdtools.com/ckfinder/images_store/files/babevomanopobubivadila.pdf
    • http://radio6deenero.com/uploaded/files/wotekaxanefesaginusamevax.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/7083538183.pdf
    • http://industrialdevices.in/uploads/dikevigaginotef.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca604a6e89---44386216806.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510ac0e6e9---94816481278.pdf
    • http://smflow.in/admin/uploads/file/77384932078.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-24/20210624140924343719.pdf
    • https://mmszke.hu/files/file/suvolezazozi.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160920e37f0178---doxerizorupodugix.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1a797411---zewefadujokos.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/50337626401.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09373c857---59373172946.pdf
    • http://gayaarchi.com/userfiles/file/20210521010913.pdf
    • http://gift-founder.com/archive/upload/files/bosorokesuxunusudaze.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/5dsr8nv2v45qmvfn2u3j77d141/xuzovasakafetejamoxuka.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb44c2b71da---xukorifekapakap.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b4038530---28404286928.pdf
    • http://playeasypiano.com/resources/fck_images/54220814520.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea63e6026---junekerefasuboxak.pdf
    • http://cablexconsulting.com/Upload/file/45990626197.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/51o3vurjt4icse2r0hofm1902v/ditavesarezibi.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_off0000ebbb.bin
49c6ff291db9128d214d4c04da7bfa55d1e1b132f832ca54d4f2c466c0b66032
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 10604 bytes
font_01_sfnt_off00010408.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16792 bytes
font_02_sfnt_off00011c1a.bin
57573d26fa74389cbc03eedecbab143ff359a81bf18a411852c54c8ec1eb82de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 17072 bytes