Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab309ee488fdc12…

MALICIOUS

PDF

81.5 KB Created: 2021-07-06 17:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cafc1335ffd48efcac8c134c5fad36fc SHA-1: 9d6eeac062d621a0de0e43eb60ea6c947e826231 SHA-256: aab309ee488fdc12235317e1503d967ce7e2eddc947bd40edb009839314d24df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting. These links likely serve as a link farm to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=put+off+meaning+in+telugu
    • https://vpntraffic.com/upload/files/kozuvikuliz.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a17c424f---kemusoga.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b678c953ae---nujudufigito.pdf
    • http://anma.pl/anma_edytor/file/sivise.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/kowudikej.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de4cff3aa73---76065048207.pdf
    • http://jshtextile.com/UserFiles/file///39641399318.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/g0lmtf8msch1heneo1ttq96653/23017141351.pdf
    • http://ecohost.ru/pics/images/file/32336727441.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab4d1a0c1---87971315131.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7f273f5b---jirevunanetolakuxuset.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608507c1b7a75---785972239.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/66be53651b888824cb877e1d82b5c735/rurifosidazizopim.pdf
    • http://nextgenship.net/upload/file/20210627162480578727.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef32ee0ca1---52075105038.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95d63a4f8---ginilalewarefezoropanivi.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d7646985c6d---90899550787.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/ragojim.pdf
    • http://sammyuriasproperties.com/userfiles/files/21617336067.pdf
    • http://garageanything.com/js/upload/files/mutobonunuxikugawomifod.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896f002d02---30706669864.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a78ac4e9---22668508470.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/50899565625.pdf
    • 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_off0000d7e3.bin
58f559d313a5b96c843e7f930c67d839eb3ac0831f9f4dc5b721a0e8efed9012
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 18640 bytes
font_01_sfnt_off000107c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
font_02_sfnt_off00011fd9.bin
bd09107c071ffb9284e2246810d71d188545948fe2d4fa29b1577b695512532d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10392 bytes