Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f300bc79c82de4b…

MALICIOUS

PDF

102.7 KB Created: 2021-10-06 23:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a328c7fa70ed0eef9030307187cad74 SHA-1: 78a24c5e5c75e4cf1408fd445398e7bc8292bc48 SHA-256: 0f300bc79c82de4b0adc4934ab8bf55b184cf00d4fc83e3bbb40d6f282abe9d5
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 links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=the+great+meteor+crater PDF link annotation
    • http://elmbbq.com/uploads/files/bimunibutaliletedelavabu.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/wupifijodiwovesotux.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/92941127044.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507676b5151---78446424887.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/88713080569.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/kejono.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109301903461958.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/vijowuzi.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/74278885099.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109040755129736.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/69936216439.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/73346634133.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/garapifegug.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d0608202---xunofereserukutegega.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/bizux.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210909092516994.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/gumobuziguwogu.pdfIn PDF document text
    • http://unsersohn.com/images/file/37530747365.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149208cd627d---49118222490.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/fivemasofosirupubuke.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/28395686377.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/juxebuxupinafire.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/13179658052.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_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 10232 bytes
SHA-256: 823f94ce518e0b8b28d581a4e136f7db8d0f8af7b58065a125bd467ba96b993c
font_01_sfnt_off00013d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 21344 bytes
SHA-256: cd55104a0b3662acfdd6943e091a984cfb0c14191711d0691f3dff97ab021ad0

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