Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dffd7860a472a7…

MALICIOUS

PDF

77.1 KB Created: 2021-08-31 03:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8dcd780799fcc9dbb82766038f3c55bb SHA-1: f688bbccc9eec01c985379793197d21b1140c305 SHA-256: 70dffd7860a472a72308749d880e4b4b0af31ffa62e658db3956b0f6a9cae4db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm on compromised WordPress sites, along with numerous other unknown URLs, suggests a phishing or redirection scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ef571fc3---wogizogovuwelin.pdf In PDF document text
    • http://hulstcustoms.ru/uploads/files/27732968882.pdfIn PDF document text
    • http://otczenacts.com/media/files/dopizaxadamusofomumofe.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/92468241236.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/33603711652.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/sisixilebujakupogawediw.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/38893184568.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/75042624112.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/jukevarefoliwamisune.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/85857452907.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/13775815235.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/wuvesofusujusak.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3398bb64---50270871005.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114353891b3a---pezuwajekuf.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cf76afb7720f25e6aea28767ea46ae99/kemimit.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/546416f9769e57b7990815d368a6cc0c/75273235864.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b233fca544f---75915017529.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sjcula0isve47hpdl7n59kiai1/94753143599.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/texazesegozow.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3e0664d2a94ea5b98c35a54ed0529ebd/kubilogor.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffee314d9---limowupaxapibezoze.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210805225034.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vogefuxinuzewivezivimenaz.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wutopamitizuxu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1365fc1c---71333016026.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/9836725807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=accounting+zenith+global+imports+answersPDF link annotation
    • 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_off0000bdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 21112 bytes
SHA-256: f61d8f5dbd69bf80ba74c04f755f32ccac06d96bbddd33a4e92226a1a9087b29
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 11188 bytes
SHA-256: e2a38ae5980e9b8b2ffbeec8c36762f9ff92663036c3b1a1b21f9c841bb9adfa

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