Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c681fbf5cd0eef…

MALICIOUS

PDF

88.2 KB Created: 2021-07-20 14:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ee5d6685c7dd1db8da5df3b22da1d83 SHA-1: 635e7ca96f3e40568e9d8b6d461743b1722419ba SHA-256: 49c681fbf5cd0eef6344cc6ba696b4541a622910bd11941ce4f17dbc25d9be09
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised WordPress installations. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing links to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/55838022625.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7979f0177---pojajulaxibewisi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/18abce3d31c48f96b6a6e05e3fa75f40/vapavobizufu.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d9cdc91143e18d3da1039c2db63fe38e/dexufosep.pdf
    • http://comp-art.ru/userfiles/file/punegalixopaxiw.pdf
    • https://coluer.ir/documents/file/wudofudizerujisofu.pdf
    • http://hrdiborice.cz/erucom1/files/files/jejesabokosamax.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/99f0bff918785549bdeabd845edf0089/diwesurelakudele.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosajenixaj.pdf
    • https://ladangmimpi.com/contents//files/31038773642.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe37ad106b---90306337197.pdf
    • http://okmarin.ru/userfiles/file/berodot.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/79551e77f819d9320026162de774d479/64703118324.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f004b0323---47089823386.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/80439836143.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8o8hbu4r07o6gtbe88lkalg2l1/67714805037.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/16142787479.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a722b22aaba8689868e48c76405f5888/91022052260.pdf
    • https://netpage.info/userfiles/file/44746675460.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be530fc7b86---67685539900.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9685ca7b7---1464813013.pdf
    • http://atek-ent.com/upload/file/31502505067.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6eedb26a0e61f1de8d875a27f41ad2f2/35873486242.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972f2f01c93---16739494974.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=redout+enhanced+edition+steam
    • 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_off0000f412.bin
3d460bca4d2b3e79598ed989193155307015d23707b191e4c7ae8d653fd7be28
pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 10632 bytes
font_01_sfnt_off00010c3b.bin
274411e1187de45db7231c7d5b22a05980a581ad44608bc30ec941435b3ebd8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 18024 bytes
font_02_sfnt_off00013b70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 16792 bytes