Malicious PDF — malware analysis report

Static analysis result for SHA-256 da09dac04d90f935…

MALICIOUS

PDF

88.6 KB Created: 2021-06-25 22:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd88a033ab40d1785a92e4e384514fd2 SHA-1: 3ff9b4ef4030a0043b527571cd6e8363688b3d01 SHA-256: da09dac04d90f935237254b04a42dc3e4db98a83ce51d392c1d8c5c1d3ed1310
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://juvelyrikoscentras.lt/Files/file/57475732749.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608025da2cf0e---12469117563.pdf
    • http://soluzionebenessere.eu/userfiles/files/87844165187.pdf
    • http://posekatzahradu.cz/files/file/dikemovazatuvimomatekedox.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rr5a7een8pj3f3j3qmkit51u6g/50044831296.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608614111d572---81983974340.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160831e297fe1c---88095913848.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0af1d72125fb7a0e264981d6cb1b7073/donixo.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6700022923db67914fe14beb53dd9874/1077301658.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160748142200c4---wovosebovamenewerixeki.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nsqrftdf6odvvp1apsg382irmb/65077048970.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/30d8bb27d5aca7c7e6a05165571f8f0f/lurogikagaredizigoju.pdf
    • http://erbaytag.com/resimler/files/78410210117.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c4cfa8a26b9ee688db03b971354ae3f2/38661343626.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a06f9284f563abba7bcb3b716e7f6671/vajanizive.pdf
    • http://haiqi-machine.com/d/files/88657100054.pdf
    • https://buka.ru/sadm_files/89714615477.pdf
    • http://dailycan.com/userfiles/files/629175122.pdf
    • http://dongphuctqueen.com/upload/files/7353893396.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5e0e8fe1e5eed84824f6b9c3577f5438/xobetimakadikobebewa.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m238n5t440bsp11kelghqlr7l2/jinukajuwuxarugobegadov.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc4319fb6---mapagolamexajososo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e1c0fd1c---koxapaf.pdf
    • https://classconnbio.com/img-jacson/files/53127881611.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/dutomibol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=htet+pgt+maths+previous+year+papers
    • 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_off0000f5d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 16792 bytes
font_01_sfnt_off00010dec.bin
dabba55fcfa71f9b799e4a19492139ec95d24a03f49ab2fca0045a0443f730d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10820 bytes
font_02_sfnt_off000126ed.bin
8db0a1f1eb5767d26f49eb03c81d7ef9de2b68e379eea127495358262f404929
pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 17564 bytes