Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb8c7784c00f8d6…

MALICIOUS

PDF

83.7 KB Created: 2021-07-26 05:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3cde8752497d0ea66741510a64068bb8 SHA-1: b4b14c3bbe197601724f7332ca97fcb7fdb290a7 SHA-256: 4bb8c7784c00f8d6b3dbb81ac8cb88e5db1a27dcd75c08207f841a12d88c6057
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 pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vdblgc5p3tdj3srvp2dmg2ttbc/89831819866.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/detaxarigixezuvafeme.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/xiwadudowufulivaxuzazi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bc4ac9056---24705842655.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/lorixaku.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c548da8c8---72350820990.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073090b63cd7---lagupuvexobogapoze.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/serisu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/59643688352.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/gutuz.pdfIn PDF document text
    • http://jngf.cn/files/file/62357073884.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/3201953309.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/84087430448.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d274826078---25816793146.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/73072879274.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/41801167848.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d166db2fa---59156202385.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/xuzakaregolalirirukeju.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92e005d58---91035818711.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/51677560189.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/86323169983.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0081puu76h3smed5n81gu59cp5/dezitubuzefijizebijiponew.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/65723401975.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8a8bf231---14891592538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tailor+leveling+guide+wow+vanillaPDF 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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16788 bytes
SHA-256: 53c408344f765922da661312d618902a1e2964bdc1ae91f54f737cff60e188d5
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 10372 bytes
SHA-256: e79e7b37f5a981795ea8b6f1b51824c3567794b4de8a9b2eda8136b5f098d04e

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