Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7283a37ec50b0fe…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 07:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fe869cbeb77f71af054af98ac4db848 SHA-1: 8e666af2ffd0a5fce124e14f472d5ec74d5b940e SHA-256: f7283a37ec50b0feb534a9f06cb6d6c69105a527167e0619c126a288ef1082bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The embedded URLs, such as http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca12ce9b0c---sefalipakeraxu.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sefufejamaxupap.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fedekax.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/50255930469.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/kuwufafegigepigegowej.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/silepobomukamimixitajot.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca12ce9b0c---sefalipakeraxu.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/firalifeziwererajut.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/10325757031.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/batuvav.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/98493633354.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/38478788305.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/sufesavenulusig.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/74109412907.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079e7e5848---xavewiw.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/ribilolo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/dinawuvadupexog.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/7799230142.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7e068859---tatime.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/momumomidifek.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/58795252094.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/fowixelibolapot.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/kulewakabosebejajakerizex.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210906023353.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/kupidolomupuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=root+android+with+kali+linuxPDF 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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 10472 bytes
SHA-256: d1521dcb3373f2e3fb0ddada805a9530aa61d3f8e1f199036943f31d09b2b540
font_02_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 18520 bytes
SHA-256: ca7047f7f02a0d6ad538f9668888983a9efe6c8a17a49795d9555ef540888882

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