Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b55ab20d44a1ff9…

MALICIOUS

PDF

86.2 KB Created: 2021-07-18 15:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8df80f659efaf191082c97b2d4fd241d SHA-1: 0135067ce524dc5e2c53d606c38625aa31a9a672 SHA-256: 7b55ab20d44a1ff9d2b57f959f071b8553e9cdc685f24ae70056f2b6843f4967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The presence of embedded URLs and the link farm structure suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/82cd111cbd6e25b57e18e1076654a827/tojotomizigivutesak.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607620471b446---majabadi.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/82976051020.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0b0eb40a---94587639775.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/xawazurosamijolewi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bf57e51086e4a78ccac519c83ba0ae4f/80036118164.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a46adf38---64072086130.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ccacdabe0d5013a91fec2750980dc77/23409215492.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6bd385ef159db9b3220fcedc254e45c0/11881685678.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/gipumenepiw.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60dd6988116d6.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/reperefisikovozixuwo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0e58b65a7820ff7051384b05f1736b81/nevavuronuda.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/prt6cut4glsvakdlvgin9f7i2c/nupaku.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lbqkg52urvr99rrbsm8eh663fk/repewopebodon.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eaa9c371e---96876864733.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40fda6280e---mubedokajugoveborizexa.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/18762153897.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/telopazor.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/37030156089.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088162c4309e---wararuxexot.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/38287e167e0147cec6aed105e57f20f1/67072749088.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/81f7750e408012220a2f3d7563a2fb5f/kawotafarob.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/55003096541.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/54219488344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=flash+alert+for+all+notificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10408 bytes
SHA-256: c896c1c61a02c449369b5ca6d8d98bcdc8a8d1d44de8295182e5887011c0caf4
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 17032 bytes
SHA-256: cc4f5def1ccf155a0a15e5513e8eea0e3d8927f419f34498cedc8ceb2a7938d5