Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c128fbe4bb14ae8…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 07:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58582d0df3074a11925eb05303ad3f5f SHA-1: dd90c69002a1ef2d1a88cad6c978490dec264ccf SHA-256: 0c128fbe4bb14ae8fcc99ad63d3855b1b0753162a8ca35a7a54d2c9d5c7e5fac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chinawin-consult.com/userfiles/30888453568.pdf In PDF document text
    • http://goldenteriyaki.com/uploads/files/79283518904.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/guxawokim.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7nap0j4aqkr8cpqqfas6pqspe6/basepodamizik.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/2368254413.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/11615475970.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fdd7bdfe7154680ec98367648bc59bb5/puweninejo.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/23760080591.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/54692530055.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/52742916083.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9e64427eea8f17c6ac2bbdf1af473332/80061833586.pdfIn PDF document text
    • http://anindecor.pl/files/file/sowosijujanubuw.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/44432593694.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0d7741fad8b5f2c06eda4ac57f073dbd/53878534286.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gokagerefiri.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/topagakapoxeganafate.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/pikenijalivoxududuwopiwed.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f93370093c9248c333f4f4ae6ad0780e/4516747663.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/fuzeb.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pk5nbfursfec57tj60hkpfe80j/79028704810.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/30038427534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=today+hindu+news+paper+in+english+pdf+downloadPDF 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_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 18848 bytes
SHA-256: bb7a3eea8d27ac1b3347cda200d0e9148efb81cf2e65a0091d81a170202cf5f3
font_01_sfnt_off00012e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 10940 bytes
SHA-256: 295fe30ff0172c0d080ce6584f750f0d95dfabddb51db04b8142808352f8323e