Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61e5142b377ed8b…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 22:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc795e123061715edfdf86595f2c1dc9 SHA-1: 58a7784144926a12a231d27f0779102238919f72 SHA-256: e61e5142b377ed8b5fd7a2be9b33e77728c96f5cf2d6eacabe332fe1d194c4c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://holocaustresearch.pl/nowy/photo/file/mililavoveruwi.pdf
    • http://aliglobshop.com/userfiles/file/39724721128.pdf
    • http://patrick-vallot.com/upload/files/sasisotezixeperazep.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/253156357ee79188c9957f967e22dc44/vopuwo.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gonozu.pdf
    • http://skolicka.eu/foto/images/file/71973316504.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8aecb3de4---12183725165.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26eb98578---35004066388.pdf
    • http://vinaaquachem.com/uploads/files/71048933539.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607952980f204---25461290339.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdb1b26b35---94329303593.pdf
    • http://golden-candies.ru/webroot/files/files/sujejofadewavorifin.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/6300441772.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mane8ajhmnhp6gtrigmnftb0f2/15870756485.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3096135c48---dukovorilap.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae36755cc55---81527862520.pdf
    • http://ksnjl.com/userfiles/files/kalimuwuvatotev.pdf
    • http://absolutelyneon.com/userfiles/file/tolipivixevobukugo.pdf
    • http://artospace.com/pics/file/jitetij.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608eb08eb6af7---daxonelixibataw.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b4b4eb2a3---74934858290.pdf
    • http://biafrapol.pl/pliki/file/14459581339.pdf
    • http://ducthoaudio.com/upload/files/27859285630.pdf
    • http://gillsandgeckos.com/userfiles/file/33647223232.pdf
    • http://zs-oilfieldequip.ru/d/files/jirulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exponential+population+growth
    • 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_off0000dc65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16792 bytes
font_01_sfnt_off0000f477.bin
e3788a529456dc0c36e9adb1cb2604afc69e09869c66a6ae81ce0bc0450b2db2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 20440 bytes
font_02_sfnt_off000127bf.bin
e8d7752981bb6b60ed98d5180f554f97a1610ed29fbe5b82c1b51430361ee0c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 10632 bytes