Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6868b6dc4883ec…

MALICIOUS

PDF

79.8 KB Created: 2021-08-16 23:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff4dab5e74d5954e5135af34d7f1e0d SHA-1: dd4f763b92b7048edc0ad5dfabde1dc9d6de953a SHA-256: 3d6868b6dc4883ecc74c06e29e6be77b14adb9031dc0bac16d988c660badc6d7
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into downloading further malware or submitting credentials. The presence of urgency language further supports a phishing or social engineering motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30c93cebb---zaxuwagawotogedisudujow.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096ddddd38b1---4012201010.pdf
    • http://doubles301.jp/files/ckeditor/files/zamafem.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1e2057655---dunanawero.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c24b53cbda5636e4c6b31869b7d85ce2/pogulobemodosanowu.pdf
    • https://geneticapanama.com/userfiles/file/77546208801.pdf
    • http://newo.ru/files/files/nibipalowesul.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b49b0bb66---jasax.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d104caf---vobeserarebegikesiserag.pdf
    • http://waelfawzy.com/userfiles/file/kowomijoxalivawopas.pdf
    • http://chi-kara.net/userfiles/file/79997111306.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4c0e62412---91293013314.pdf
    • https://bahceneryaman.net/public/content-images/files/38688711589.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/47633069958.pdf
    • https://alternativecarrepair.com/userfiles/file/20411046038.pdf
    • http://bibliotekaludwin.pl/img/upload/files/dakibagepapilibulesi.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c305026a475---wotezanuvopagijipopo.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f16abb32105---ferikajilurexu.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d82431260---73439643132.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/tugefizivejok.pdf
    • https://floridainvestment.cz/files/file/gofebolegusobofokupa.pdf
    • https://lordoptika.hu/files/files/nunomefiviwepisapiferefad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fce+practice+tests+plus+2+with+key+pdf+2015
    • 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_off0000c6d9.bin
030e9c8236cf9b0c64dd4fd29bc94a8dbe063137f0136a1dea36ca51d473ce26
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 11288 bytes
font_01_sfnt_off0000e1b3.bin
e97352663a297c4eb44d67b13afe209cf38ad3f49574c28cd0a1027ea07b9951
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 21504 bytes
font_02_sfnt_off0001187c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes