Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeee164e0f7d6609…

MALICIOUS

PDF

96.6 KB Created: 2021-08-18 21:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6d832cd1e0f900577f22ea5cd45b2fc SHA-1: d513372f242af13802d67532fca961e7b5fd1352 SHA-256: eeee164e0f7d66098fccc424f6476f9e765f6cbee7866739e2658e223bdb7a35
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. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://dfh-consulting.com/userfiles/file/nefupenofuwezenelanubuti.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607563ad1dc91---fozemiweruwixi.pdfIn PDF document text
    • http://df-foundry.net/d/files/25071725697.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160caca67b0193---zonasuzeda.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2db77248a---48058530959.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xejajevosozo.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/77747830734.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dq1v4g2fqf9pjbk17558l1465j/mipiberewiruxasuzomo.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/sesibovadebumuda.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/96877283111.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/susuvamaxil.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/99428041995.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/tiruluta.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/49764016386.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4813757226.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/8343812332.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/jubijasonimipuworutirevos.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e8spebahebmfq8cg2vf0fr130q/roneg.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/dupilafevawekilavu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binim.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/38d5f427ebb4e982cd1bb4cd7df7f65d/85683661737.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/lutodejekojujawajinuwoxub.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a426568e7---61375077333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+download+hadith+books+in+arabic+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e70d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE70D 25320 bytes
SHA-256: 7ffa86cc88e824baabbfa3b3313c85d4975a1d0c8ad0fa28e38eef9afd7cca2c
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 17444 bytes
SHA-256: bd449fb540e8262ad3a919994258546ecaef0a6e1fcb3300bf8a0647f32a1bb3
font_02_sfnt_off000142bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD2 11012 bytes
SHA-256: cd6051c261c8da4ac91826189a7c01212dddf0ba946737f16e0854d6d70f6071