Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e275b385ba56410…

MALICIOUS

PDF

96.4 KB Created: 2021-07-13 06:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53ff2054d8ba6d8b82d6eb92c440e1c2 SHA-1: 6e7b3a73e30729c43cd3a0600fc9f2d1abff5380 SHA-256: 4e275b385ba5641007e78779568126752a841ed4ac6297db2f5c61e059d58204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=knuckles+chaotix+manual PDF link annotation
    • http://atek-ent.com/upload/file/pagarulasozekodef.pdfIn PDF document text
    • https://vestol.bg/files/file/lujimupajemipiwitupomawo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7ea4hkfn8cppsr6rcpo18kgpph/dorarutovirabiv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc614248b---38650094452.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1a846233---45305232954.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838fedbf064---novibiloxolobajunal.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/kunubobumatomegubi.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/47286822707.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1c9865b5f069c533da6be916e855c141/vujerodigisib.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/7411232451.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026b7ca81f---muwunupixoz.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/ganeroja.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6ddfd98bdddfdfe20ed0219ecc4bbe64/78829172772.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a2dd6f10---reremeponufux.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935caa34532---48852142197.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae338a97e---jegodunimiwojamup.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/sekufinipidizidivesiwubi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fowalonoju.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7c3b26278---dalugezarifafob.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/nijalazabodog.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02d0936b7---41991481539.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fe82c286---7548248156.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/65950775625.pdfIn PDF document text
    • http://edgecs.net/documents/zopadirixofapigojifu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10680 bytes
SHA-256: 6c75280efa7b4697fa191d34141b4b1f7a3a65457dd8cf87dae8fb96a1b8a5b1
font_01_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 2192 bytes
SHA-256: 16e0b52abbaa9ab7af8377bb99c4c050458ae58ac2378b7d58e4e183c0f7c599
font_02_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14764 17124 bytes
SHA-256: dac8d7bd1b2cec15b0dd80fcac1487f5b63a0e157f4bda4ce9608321c77c81b4

Open this report in the interactive analyzer, or submit your own file for analysis.