Malicious PDF — malware analysis report

Static analysis result for SHA-256 0787609171742bde…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 01:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0cb64fb0cbf537cf0011d7b59d1e3ffb SHA-1: 495b4b0f3ba01c21932297ef1eb15a73538caa16 SHA-256: 0787609171742bde150ee990ac4ce8d627dfb7c4ea4236f6ff4c4ed193dfb811
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=english+grammar+gerunds+and+infinitives+pdf PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/unh60rl4cbk84u3mv5f7k5bf85/74084049669.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea1498073d7627edae4ecdf50a38ff71/sajuruwazolor.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cd4733a2f08ba5d2064bb8a42e64e448/24109948855.pdfIn PDF document text
    • http://mastervin.ru/files/file/1395520988.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/7816095979.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nq7bk7f51fo1i67dqtamhncl53/wipero.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083666811b1d---30989122225.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bce06ea76b5---gonopisozosuguxebe.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dhjmda6gvvqfm406h67eavg0r6/74635659218.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160969c056e1c6---72072274481.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/14901072448.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/mozoxuxidirujetu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f69e1f61c497e0114a93175ebf5e9e1/kopexaxosigoka.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a54cef56---22931502824.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7f306206cbb55f59e1eb2f05f3186013/25741396157.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/37f00c43ceeaf69f3c69d0ad512b67c6/74074379395.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210802110216.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f34e28e841101491922d7f9e5664ef6d/8818285680.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f903f05aa2bd680dbfdf87f4e6dcd891/67805576707.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/73579121051.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/65430649645.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cad18bdb---pomokapogopomabot.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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 17676 bytes
SHA-256: 42f13a51a8ae933c92c8f03f25ef23573339d00d56f98f7a9d29385fa4bcf81b
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 10972 bytes
SHA-256: 97df5e4a08507405651fee604f7ce9ed237124c5fb953649b1f3a03afcdc99ef

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