Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a1ed163a1752a1…

MALICIOUS

PDF

79.9 KB Created: 2021-07-03 15:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c771ca8eae69508ee1beeded24ac21ee SHA-1: 02613f6700e1d160dadf97ce22d6e6b96fa2fde8 SHA-256: 89a1ed163a1752a1f91322f37a844b25196cf3bc980f6362f52d86d8df99e910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The presence of external URIs and link farms suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1801e019---57589909016.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/vujutaxiniponapoduv.pdf
    • https://ascinfratech.com/clientprojects/trading/file/zolutotezexidugev.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f12214130---dupavimeforabexi.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ivno700l2bf0m7vorjff8g8tb7/wezuzijexeko.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b63a8f406---bitukawilim.pdf
    • https://dodatnojamstvo.com/userfiles/file/82181126311.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1a39f2e3425d96a97358675dd3652c28/bavij.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c725512e35---78472151302.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5dadbdb8b71a22608783bc14593ca1d7/wobuxukuderimasebobaxozot.pdf
    • https://local-atlas.ru/userfiles/files/15037432236.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4677672c2c487f351a46553c863a8940/govebemotoxex.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ab9daf447---letinejup.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de98ee0083---bobir.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647ab46040---30489198680.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8a3a30f3---72174219828.pdf
    • https://ctapigroup3.com/contents//files/15183393503.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3203233136.pdf
    • https://mediaget.ru/userfiles/files/88969708667.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/pckh4o20idb61a069oett0g1pv/wunolefizurolokunuzuwef.pdf
    • http://sbox-technology.com/upload/datoteke/13563660130.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dr+ryan+riggs
    • 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_off0000d912.bin
01c9c363af2d8f74f06290ff82eeb9091dfa1fafc55ae08270af56fae8383b25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 16716 bytes
font_01_sfnt_off000104b0.bin
01d5bcf9ba70bc5a2402ea9a3d51459d2e8d56b4b5d0e338de43e7b2efa70b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10004 bytes
font_02_sfnt_off00011af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16792 bytes