Malicious PDF — malware analysis report

Static analysis result for SHA-256 882f6c08f42816f0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-08 12:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8d4080fe85318b00d11c80ec19493727 SHA-1: 2539a184af95d12fad1988f905d74eaba3e49d37 SHA-256: 882f6c08f42816f0eb7b0171b375ec4053a979950069b1a84aad8dec78620279
176 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only document designed as a lure, containing a click-outward action to external URLs. Many of these URLs point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mwcapital.net/ckfinder/userfiles/files/zikuvusigo.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e524bded9---67302609040.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/41239329689.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109081346164077.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134fdcd68bb8---kababezoxu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/3988823022.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613872b7a5af4---28161185271.pdfIn PDF document text
    • http://it-hair.com/userfiles/27529025458.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/30542224439.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/27089217606.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/suvonekisuka.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/junaw.pdfIn PDF document text
    • http://aurora-c.jp/files/files/59835636470.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f80e7e198e21a803da7dcb0378546d33/lobutuk.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090323552273499.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/juvaluf.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/61474948090.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/dezirerovinem.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/30667865054.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/33378009921.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/mitanibodisaleji.pdfIn PDF document text
    • https://endobible.com/userfiles/file/17119603648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pka+values+of+amino+acids+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 14064 bytes
SHA-256: b3d4c4487e02833dc586eaa9d4e22d3bfe2f1772d66be945c0c6c60223e9c936
font_01_sfnt_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 10844 bytes
SHA-256: 7350c438666fb980dcdf0b1bb91040ac7ada5e14e66332f97689f3a31b42d6ec
font_02_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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