Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e9576a93a8363c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 17:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbdd46b4bec435239e7694e1ca2cdc58 SHA-1: ef81573c9ee687593640feaa5b9b09d3a0fa55fb SHA-256: 51e9576a93a8363c67c4ff64bce715718d66cfc6c12c4ea1ee1bb9b506daff28
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.annaleehuber.com/content_files/file/90128059903.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/080e73f6ff7aea6a8f918a7c503b1737/49109113368.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/sisanodef.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/madarilin.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8bac7d8bd10aab140930ee4b4d664b6/17189726982.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/svq4bqdutfglng64hcmn9irdo8/53748468385.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/lelaxagitugogumetepanuzo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9c5c3cc3---57754133574.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/kuzakagagewesuselepalosu.pdfIn PDF document text
    • http://24cvety.ru/upload/files/78670094523.pdfIn PDF document text
    • https://turbooto.vn/upload/files/31272587035.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/nawiruzewobibebobe.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/9898630106.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fukazabivazazomik.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/86245652965.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ja47nce5qk8fdlpr6s180lvdt1/95227526854.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcf615a8c---13950819659.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofebomatekarinizebig.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/43104299013.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/sevimejotajawuvegunenivex.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/lexowajapomoxigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vishnu+sahasranamam+pdf+tamil+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_off0000b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 10788 bytes
SHA-256: 26da5735bd323c9015c4f4784de71b2579f83a083aa6d542aa9ad52d472680e2
font_01_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 15996 bytes
SHA-256: 9bcd470ef1a445d4ccbafb7a5375271f05d2c3de8a33062689e255ec4872f7c1

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