Malicious PDF — malware analysis report

Static analysis result for SHA-256 63af8ee233861e6d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 03:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abfc76a931bb79925d991c05d4a802f5 SHA-1: 19e998078615ff627624efa6ec59cbb25164a73d SHA-256: 63af8ee233861e6d49a7f9632580a61dd9d8904505a54fac8126058562eedd0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=funny+teamwork+gif
    • http://moscow-vernisage.com/files/files/weguzema.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/senagikuko.pdf
    • http://cycling-software.com/files/file/sopusovuxudi.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/99217025903.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/34988162890.pdf
    • http://nwhouse.ru/uploads/file/matuvixid.pdf
    • http://metaglas.kr/userData/board/file/jigubisa.pdf
    • http://faurau.com/luodan/images/userfiles/file/jonoto.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/3564848349.pdf
    • http://video-cycling.de/files/file/warokojubebatogajuxu.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/rupiwimovedubafabafu.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/80158784698.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/kepuzakexeka.pdf
    • https://dafelia.com/files/kufafefove.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gb1vu1hh28n46ec0f6oalnk2h7/pawewowowuvukofedavapodad.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a2af8eff7226ba485737c0c4a6d9d51/juwomixesutabakepijav.pdf
    • http://camelliafb.com/uploads/files/202109131111202292.pdf
    • https://celebicatering.com/upload/ckfinder/files/xakavasinazutu.pdf
    • http://divapharma.com/uploaded/file/80493006968.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1idsefu4n78cgmjbncqf4ieppj/30465269974.pdf
    • http://kindergartenhelden.at/upload/file/lutowupixowubo.pdf
    • http://www.sauminandy.com/fckimages/file/91146433985.pdf
    • https://intrigantka.ru/images/userfiles/file/47633622943.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/94830062091.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdf
    • https://viadagio.be/userfiles/file/39904249574.pdf
    • 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_off0000c987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 16792 bytes
font_01_sfnt_off0000e19e.bin
d11ccdfcaf1bf6e89af8f2459ff0e9201a724bbfa6c1f3889f87c53a56146a07
pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 10712 bytes
font_02_sfnt_off0000fa4a.bin
68eb0e948cafdf21dec977c9b52870bb64b08a36a2c5247f74b1c82f913cdf19
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16596 bytes