Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fb387677f9f756…

MALICIOUS

PDF

91.4 KB Created: 2021-08-09 03:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faf85cec089696a109f5dd0bdddaf136 SHA-1: c9ac9044c418f9f58c825a96dbcbb98cd73601e5 SHA-256: d1fb387677f9f7567edef997aba7424828bacfd4ed9103c8f48fa1cb8ccc64c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sananselmo.com/wysiwygfiles/file/18643901412.pdf
    • http://wadsoda.com/UserFiles/File/nefivefumaled.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/luvuxudefive.pdf
    • http://cioccolatogallucci.it/userfiles/file/rerovufefofinukaguda.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/tajitawawekoguf.pdf
    • http://pc-driver.ru/userfiles/files/16776528800.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/llgfiv3l4sojpparsm7kbk83n6/39375499860.pdf
    • http://epmachine.ru/d/files/roxizerinotuposoka.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/75250631614.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0bm8qhm8r9p0pn05atb68auqg8/wesume.pdf
    • http://mebell-city.ru/ckfinder/userfiles/files/jafavajibum.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/qtf98gkf3nbak0mvqp60n139ok/kopobowubodaputubavit.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeca6d4375---sivawazizirotativemizufar.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d72d2db3f3c30a51de4185a58a20407f/zilivaranunopujuzef.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/limeruxizokusexip.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6143df58---diwawifubi.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ctc29t1biorg6615vcp3n56ru3/xazexolesemafikudizi.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc44bbe9559---mofogajigafewapadox.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db3b8dd64---tepetupum.pdf
    • http://newmob.it/userfiles/files/bubunifopov.pdf
    • https://heyratacademy.ir/file/vuwisuralurefugudopom.pdf
    • http://asbufestival.com/uploads/FCK_files/file/dopesexeta.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a160d11a---sedebimoxezarelapibo.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/9143489180.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef311af2e---kitiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=2019+tacoma+maintenance+schedule+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_off0000fec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 16792 bytes
font_01_sfnt_off000116d7.bin
0dcc52b9e6dac2c717126729361ae7391883b7b48abac62d0c2e1110a8ec0058
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 11248 bytes
font_02_sfnt_off00013114.bin
c8298483e5cead69e4f8ead49c69d1bf74bf918f93dd993276f0c299efade428
pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 17276 bytes