Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a40d2cdf5a2742…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 05:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08470418af4ca74b2092e9890cb72fc9 SHA-1: 255b4953910d84f91b5ebe27f5686bd612c90f86 SHA-256: 67a40d2cdf5a2742f6aa2d2baee8383b6491aa2d1b1c4c41433042099a3831a1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://amirafouad.com/uploaded_files/file/dowiwugirunivudadogejur.pdf In PDF document text
    • https://alrukn.co/userfiles/files/lumasegewakamafoporaneg.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ac5bb63b---zoxuvakife.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/81191918393.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be8d8fd9b96---bozaritunisofaxirita.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tomazalefusaxar.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/19216158384.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42721434087.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b7vk1oc33v70452osomu4ff2uj/xifirujumifaxupafegadet.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/wusotedabitapopugale.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b686f662---sivabivuteri.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b804d715d66---gamopanumog.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0260a48a8d---26630880057.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/18283368033.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/69296859946.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/60188479174.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9406370ec4---fefuzekavuzijetoj.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7edd54c7b1536295731352e809d7c8fe/95401790153.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0af800189---wexum.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f5390ec599a800547681e6db808959a8/nopatofi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4i77ft3bslavo852ff8m63g4j7/bafaxabilapijaminuduvo.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fizaxefewunudezexufoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=advances+in+fish+processing+technology+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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 17984 bytes
SHA-256: fab3a4cce6a20bde8e2a2036132cbaef993d3f3f01250609137a8e8f6e1cc7ed
font_02_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 11060 bytes
SHA-256: ddcd4f690ce0df19f8e587dd76212b67acc5f71e59feb195a8949ef10e2cb883

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