Malicious PDF — malware analysis report

Static analysis result for SHA-256 a422a5685a9fa814…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 07:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70c033498690e91ff956662d8b019a35 SHA-1: 3a1aecfbbb4769bd8c2bd8803c500a95704c804f SHA-256: a422a5685a9fa814737e8d53344026b5e677a9d5ccaaada141026d5afabae0ac
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and the presence of external URI heuristics further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=introduction+to+sociology+eleventh+edition+pdf PDF link annotation
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/6266360253.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kurawakojiwowomamutiso.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/pixaro.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/26528807334.pdfIn PDF document text
    • https://matricula.arendic.cl/files/64023394399.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be90cdfaf---nuxituzepolibuxapef.pdfIn PDF document text
    • http://sjanzee.nl/file/81121489044.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/98679675393.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/10015496761.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/6991900531.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/91730740453.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/ninoruwatemuladebamudop.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/33255646551.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/25902163624.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/fizuxasixelujugoguzut.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/17883724171.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/51300006584.pdfIn PDF document text
    • http://live-net.it/file/vetuni.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/zifubebij.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/24pvbi4574hifsslla8fubh5i4/87389673568.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613f97a71e9d8---99231444216.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wilaf.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/83385433207.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/xozupuselupatoxulope.pdfIn PDF document text
    • 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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 10968 bytes
SHA-256: 068199dfffef34541c072638c042a4876d304fe9481be6b2deca5f295637420d
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 14960 bytes
SHA-256: 40626ba0932bbf8b5fb95acffd64fd11b92995590f1b71c500de13cd8594bf99

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