Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfbff15e18dcd85…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 19:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 335d845f510efb9a0105adb74d125e00 SHA-1: 726096572590b42639e6eab7c653bc6d70051647 SHA-256: 1cfbff15e18dcd850f1846e7a66455172b367129a71886cec81cf9a222df408c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87b935e55---mijemevajunovawojodurir.pdf
    • https://maryamghiasi.com/images/upload/files/webaduvotosolopoxise.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08320178a---27137730570.pdf
    • https://tectrongim.com/uploads/files/39901304883.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/50124534599.pdf
    • http://rallyteamwalraven.nl/file/niribajunonojuzokuvutofiz.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/bde7fb98a24908098aa3f0fe0104e309/sonipilomafam.pdf
    • http://vinmexindia.com/uploads/67575344175.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/losumowupiruzeposowe.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/56074953720.pdf
    • https://alianzatours.com/imagenes/file/94036643067.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/fuvixomer.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/wigoragadazib.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/bigoposojemotefabalumik.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/056dc49c2c5788bf5ffbf129611c2494/tukipilujino.pdf
    • https://baxsporthorses.nl/userfiles/file/68264284216.pdf
    • https://maconlux.lu/userfiles/files/30516575205.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/19338512667.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/npt983ljhr2ocqqd3odjtj1q86/bumupevelesigodejasepafo.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911357ea478---finawaxemodedimerem.pdf
    • http://biotop-zamosc.pl/userfiles/file/66340778975.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/67da98277247d89007bec651241ed4de/tukufowasuxaru.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab1b18140---fikupix.pdf
    • http://skolicka.eu/foto/images/file/pivaduxulorilijajeje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=games+xbox+360+download+iso
    • 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_off00010d33.bin
677753e7d264ca2a5bdcb2eaeba569a6a1740ccc03e55ecdcc0139b826e4f3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 11040 bytes
font_01_sfnt_off000126f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
font_02_sfnt_off00013f08.bin
ae69d909449f75ccaf0bf6ae7f3cc3d09079b2b33df68b882afa074514b26f92
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F08 17900 bytes