Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f22ba9f9d09c56…

MALICIOUS

PDF

104.5 KB Created: 2021-06-30 07:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ec93ccea76dca74db88a454134381ff SHA-1: faca454db7cc87f127738fcfa1be9389dcb0d58e SHA-256: 20f22ba9f9d09c567b286e68229e457e19c7eb85359d3eaf9482576656dd50e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The embedded URLs suggest an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://szaniterplaza.hu/ckfinder/userfiles/files/56455410063.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d3eb4a5c0---zigolemoku.pdf
    • https://alice-immo.com/userfiles/file/25349816797.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd96630dc2---92417386154.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a52d560d---15820264540.pdf
    • http://buergerforum-tirol.at/file/luravokan.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cbfadc52e3dcfc111e1a5f3cfc672946/juzikugiboluzukimafavaje.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/420e3cc28d6acfc479c26ed3cf1977d2/jixafidadopinajowewibak.pdf
    • https://accu-split.com/userfiles/files/dawonokuwiw.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d87762ef3688c58b66340813c58422ed/35189909653.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607560a0a5ac6---41706518216.pdf
    • http://mp-journal.com/media/file/rexudapefoxeb.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3c858c47---nagagogepokodesujo.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072574f8c78d---26629951188.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0d287b89---kemawojixumununawalom.pdf
    • http://benrassam.com/uploads/files/mutop.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5711519332---fabesipovaw.pdf
    • http://guojingmall.com/userfiles/file///12818498674.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/fatulagoranu.pdf
    • http://kaupa.cz/userfiles/file/7562985185.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbfb2c1fc---xeverituzimubesox.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/92f27433a0df630cd3f07cd7c0f365cd/jofipob.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a533b664f6b---jeduf.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/80351799287.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8d2e95aa7a3c37771e8f88867132aa6b/zoxipaxenalajexiviwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=teesta+river+is+the+tributary+of
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010d43.bin
0c184d83d3460cfb00481116c001e4c2fc6261b5ddf321d9a69752e2c25bcb17
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D43 19540 bytes
font_00_sfnt_off0000f504.bin
7f2e63044e2eb2c54ea3a24bd1c4525911c638dbbf2ae890e27b4e9d1c3e300c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 10544 bytes
font_02_sfnt_off00012e39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 16792 bytes
font_03_sfnt_off0001464b.bin
4ffd11d52346d81b74f45c0f2e5a7bef2b8d4361dcfd21efff4f9176c0ace244
pdf-font-stream PDF embedded font (sfnt) at offset 0x1464B 25516 bytes
font_04_sfnt_off00018716.bin
f0183cf1a4ab76df71be679b673a40a37dadc1efaeedcc07e1691efabe562e36
pdf-font-stream PDF embedded font (sfnt) at offset 0x18716 2960 bytes