Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d161a65ab8f865…

MALICIOUS

PDF

67.7 KB Created: 2021-09-19 15:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1af8907b34c7f48e4db54dc70f002c8 SHA-1: 8d8358626d0a3ad312cb7139723c83766750154f SHA-256: 73d161a65ab8f86509b9da0e4a03b79987329822735ff0a0cd83c96cc982780d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which point to various compromised CMS upload directories and disposable hosting sites. The primary link, https://smidgel.ru/uplcv?utm_term=cell+phone+rooting+service+near+me, suggests a potential pretext for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=cell+phone+rooting+service+near+me PDF link annotation
    • http://vmkmsz.hu/userfiles/file/pemikus.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/25219319110.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/binikane.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/92028376033.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/64471734048.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d4cd7674a57b7bd313878ba0fd343598/63245385206.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7ejef775or56dnp0m92e67si33/89419157719.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19902372963.pdfIn PDF document text
    • http://sql110.com/pic/31760712294.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pamatos.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/diwepidawevot.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/lofewoziduvat.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/kaxunet.pdfIn PDF document text
    • http://hainfelderteich.at/4432721442.pdfIn PDF document text
    • https://titishop.co/upload/files/rafovofowila.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/60860166486.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/jasikupezowuxiriji.pdfIn PDF document text
    • http://coffee33.ru/archive/file/varuza.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/16839880513.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/mefiwazodikokoteposef.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5a3a8aa4c79620734d0b7b492af5da9a/9509957385.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/31754567582.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/lugawitut.pdfIn PDF document text
    • 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_off0000ad66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 10920 bytes
SHA-256: 40287cad7cbab4714e2e85c9cb623c05056343167ce52abda020a968735f1122
font_01_sfnt_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 14012 bytes
SHA-256: 6f02bea4b023e8c2f2ad843b7da2c338b43bf7a6acf1095bb7c35e82381e74ff
font_02_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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