Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5abf5dcac5293a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 09:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 492e95a537713f5cfb5e85f03ca74a12 SHA-1: de6bd6c5414174a29ed969278b65c055778c3546 SHA-256: 7c5abf5dcac5293a4c29ff480c37ff98570ec669831d973d589ff30c5c1ed866
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The ClamAV detection further supports its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://lacaune.hu/userfiles/file/xifurazewagesepokaliseb.pdf In PDF document text
    • http://goodlack.cz/userfiles/file/rifigofelobodewawe.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ltodg6ii2camfc6dl3pl50d57q/wurenepajobelivodeziwe.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/61534760924.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a1c97a6b122d8a59f77fa93fbf4d2008/migorereda.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/15483877018.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/14266424101.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3021f502dd---sinafidegob.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gapk0296svevdo9u6pmk7r3f77/kinolerutakitowigezazanug.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/32170137129.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/sovowud.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/64312061560.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d78ea0b395f---9766273969.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf1c57c27---48314232700.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097b6ad6cc65---lasoruzuzubokudagexeki.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ddf29db048c9d6a2d8e5c46fa42803d6/vilipil.pdfIn PDF document text
    • https://daismene.it/file/ruvotemubik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bdc0b084---84327056182.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/xowituroxaxemij.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/kovilulere.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hsb1c00qsc4qlb6nvs3kjls3t2/tazixinapifimemodo.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/86962803100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=korean+words+to+english+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_off0000c0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A1 16972 bytes
SHA-256: 337ea228f77fe47091651277ec0b5f6261d35a4f1230ffd3c2b476ff96aaa7cb
font_01_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10856 bytes
SHA-256: 90b83991682f35238721eff33979d36fe9d5c8d1e0f80026cc272bd45b0e5155

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