Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd83b1f2c3063fa…

MALICIOUS

PDF

87.7 KB Created: 2021-07-15 21:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65c7ca8f0caeac76ce4f9d471fd28311 SHA-1: 6ef3a3e7ac99f13d1c6a2f1ec8d060def3b60a92 SHA-256: fbd83b1f2c3063fa5ff20d7f43b3e8344e28cae475683503ce4d3960f2e60c57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to phishing or malware distribution sites, indicating a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/k2kb9umghdifnrgftcrpahopbd/zanivikunokagazamaja.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01dd669569144e576e88e305da015312/xefiru.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac7088094d7141f94b118515e1e9f19/jupixitifi.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e6b398f5010b25674c136ed5cc496e49/20445653636.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tajetimexuwinosanolitobuj.pdf
    • http://classiccar-jp.com/js/upload/files/faloxivexonulog.pdf
    • http://artside.org/data/temp/file/timevunevedawuninobasu.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b115b89f2944a91e1d11612d4f0dd985/97888058299.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tlo8rv2cj8shfurkvkhpmuuf3q/9964556982.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/748597e5aa63735a2739fd0e7684aa07/vutezuramajasubisewutu.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b93832f8---xalalow.pdf
    • http://portaldo.eu/contenuti/upload/file/rafijodaxunanonevufi.pdf
    • http://musiclivemarsala.com/userfiles/files/74926903405.pdf
    • http://architettoseneca.com/userfiles/files/getimazawerokavuxitipili.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf9b6e0e3---83844387509.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/67243071428.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c97586a0715---29368762107.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e7abf152---kafijazo.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2u1d27246o30pnhj4hb7fjehhq/povolufu.pdf
    • https://bosingels.nl/ckfinder/userfiles/files/13818404141.pdf
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/6937205567.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/eba6489f37f808632bbe1a8d39a11bf4/fabosofebimapulefobobubo.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/74727324507.pdf
    • https://daiichigroup.net/uploads/news_file/wefonodijetevotozi.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/esfhtn19ol30791c4cfs33lgut/11696985204.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reason+for+leaving+a+job+answer+on+application
    • 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_off0000f0cd.bin
4b2e0aee0315feee99f4ec9d5338abdfe026371ae126fd41dd0e5b79496d482d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 11124 bytes
font_01_sfnt_off00010abf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
font_02_sfnt_off000122d1.bin
e4a10141e55542be584525e83ccad7a8b5e5649ed4b5b39718a56e3b57ee4cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 17788 bytes