Malicious PDF — malware analysis report

Static analysis result for SHA-256 550bb838e1878f40…

MALICIOUS

PDF

95.1 KB Created: 2021-09-05 06:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 156a058596e23b9c28dcb399a863a937 SHA-1: f5cd2b1e5c8c6a95d6cbae2508e1d1999141a14a SHA-256: 550bb838e1878f40faa8eb515c159cba5b3474f7a6ef6fc90e6e44e13ba15bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612dbb579b999---27371746216.pdf
    • https://starwebline.com/calisma2/files/uploads/23172548104.pdf
    • https://angkoronetour.com/userfiles/file/fuwiwedudeteji.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075579383028---lutowulorilunaruzuwis.pdf
    • http://etkindenetim.com/resimler/files/wisulukuzefujejatu.pdf
    • http://franceplus.fr/userfiles/file/vixetiluxelojetanagune.pdf
    • https://accu-split.com/userfiles/files/15512339648.pdf
    • https://dintek.eu/uploads/file/pugoxagudefil.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9db67ec3---voguzufajafurole.pdf
    • http://www.elstar.ru/uploads/files/roxujurafawudozax.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4tecgvhhndili9ugtp1m5clegk/50911255314.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6bd3c8a5---sekupamikut.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703ae59dac2---girogolatobewidokeju.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/49becb3e04a8969600410450cb6d3088/76408303753.pdf
    • https://chp-travel.ir/data/file/23370646609.pdf
    • http://feach.ie/images/uploads/file/93972203553.pdf
    • https://memoservicesrl.it/file/57257968486.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ba6685f9---81873712019.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ibekfp7c53q3knhl1ne75elnbc/vapuz.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/16878868783.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/be667a9a5dc17f9745d054d99cc1aacd/44557726114.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c641286c90c---niwosewupu.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cdc8064b---xurigidakonusavaf.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114327440096---varaxefupuzijalavomiperi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=uu+ketenagakerjaan+2013+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_off00010ce7.bin
ea7a9b5d471a672f4bab87e101410a18cf8300ef37c0f302524286436de9756c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 11040 bytes
font_01_sfnt_off000126b1.bin
73aac57eb507c2df11e8799ff9fcb9a60eb4be5ab13ae6e103a47279f8c6cabd
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 18272 bytes
font_02_sfnt_off000156a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156A8 16792 bytes