Malicious PDF — malware analysis report

Static analysis result for SHA-256 8164c70d25baadae…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 11:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e62b515461c117795ecc4c88ac049f71 SHA-1: 9ce543ceb41c643c7168836fa4806294ad0a1f17 SHA-256: 8164c70d25baadae79929e90cc44f1d9dcf5e9bae5db9722c7f7d6cdb2a35941
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://allytemp.ru/uplcv?utm_term=a+quiet+place+2+horror+movies+hollywood PDF link annotation
    • http://ebiocell.com/uploadfile/file///2021090310112359.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/39843767172.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/6970346103.pdfIn PDF document text
    • http://reopen911.info/media/file/85144212177.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/lilavotelovubiperedepona.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152830e9d85a---93165316862.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/66708176923.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/kobafe.pdfIn PDF document text
    • http://njxinbell.com/upload/files/raribesavowokoperase.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/64774054016.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/99384793584.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gufijemetobudifel.pdfIn PDF document text
    • https://kermanrooz.com/img/files/62243067621.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd0370282---nigekazajokagenifegas.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/boliw.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/77678947197.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/95275677977.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161416d6f95191---9855804068.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nogunubibonifarafogod.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/lemesegosupodud.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/kegefi.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/somadoxokukisidakudex.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/todunavotudererapolubo.pdfIn PDF document text
    • https://haidangpc.com/contents/files/76333695703.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE90 11288 bytes
SHA-256: de3c814d5a5e0035ecad4acd7f2a37b86f9a2e936be32edff0d9c79051d2ba91
font_01_sfnt_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 14676 bytes
SHA-256: e98d182d604b34126dfcd64fe63f262c039f8c46861b0d13a772b5784e14cf58

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