Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde3ee0b95f95559…

MALICIOUS

PDF

100.4 KB Created: 2021-06-30 08:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6488093a59ab4d6368d81c88f4d81600 SHA-1: 37690dd0bbc94bb0d520ccddce03d5d76fa24e6d SHA-256: dde3ee0b95f95559d6f3a4fcc9038549291f973d7032b434f15ecc9756588081
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress installations, suggesting a link farm or redirection mechanism. The presence of these links, combined with the PDF format, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f84bf9b9---34574640661.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a8dbb778---vexifuzexudoreve.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9dc8becd207703a2f1da1041d78ef7a3/31126652738.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e250849f---maxozedivud.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b3601919---57919280713.pdf
    • http://rheinmotel.com/userfiles/file/90472359126.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mufarepu.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9da5fe099eeb1b1edbfad495766d7109/nudafowumaxugijotunumu.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/rafitim.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c28422c785---3102011607.pdf
    • https://didacostruzioni.it/userfiles/file/gavomukifirowob.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/98940557283.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d370be74771---90775671135.pdf
    • https://sunarchegypt.com/userfiles/file/kegupurodep.pdf
    • https://szallas-karpatalja.com/upload/kisuropura.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fb21ad98---48013695744.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608509018f5c4---28115961176.pdf
    • http://denki-shonan.com/uploadsfile/40467522673.pdf
    • http://askort.pl/Upload/file/24790144727.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc37cd5538---37162528721.pdf
    • http://cheers-gifts.com/userfiles/piketemuvisuf.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c37b539e64b---98487138646.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c35385a3---45888684868.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5a993d4b---4207840594.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dichotomous+key+insects+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012815.bin
aaa96535a9c5ef8df4852142d32bcdd1673aef3704146c10583f603799cba230
pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 16880 bytes
font_01_sfnt_off000153c0.bin
008af44e4d192670e8b41033f63bae40309b5599ab796952818a5e6b3d15a2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x153C0 10680 bytes
font_02_sfnt_off00016c2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2E 16792 bytes