Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fcc73f18f6795b…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 06:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1191c7f82a0655f350a7154799342454 SHA-1: df2fae862f8da044475dd3cae569b7d3167c77e9 SHA-256: a3fcc73f18f6795b6dd776b8ac4d83a7d337067379732e889a10eb9184c23abc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://huntic.ru/uplcv?utm_term=sala+de+masajes+cd+juarez+chihuahua PDF link annotation
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/29364954131.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517004756878975.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319f198809---24817484937.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/dokipogisoviroz.pdfIn PDF document text
    • https://anjingliar.com/contents//files/nunog.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/deguw.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dukelu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a49608035dc2b7dd24e54b5adb26910/rafiniroxeganepegajew.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021730143104673.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc471b81c9f---xagenowavaluxam.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lawixidazetosuligikefo.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0cc17f436ec0b5c4050f5a96a61deba/43023732683.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/93201cf61dacf013c85aa19afb514961/gamorerefufaw.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/84213201763.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/93339121772.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b578d10695---24121524238.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/jobosixafenakuxekefipaged.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vafisabig.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2c21fd80---83650182445.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/63902596875.pdfIn PDF document text
    • https://tigapilar.com/upload/files/dijowus.pdfIn PDF document text
    • https://noddy.nu/images/file/tijugesolot.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d6fba0740---1785357142.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jhnle4ogcv00rju61k143mffm1/jamufagajawalatatijutova.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4607c44c4d---jemuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 18300 bytes
SHA-256: 0a76ea14d612dffce1acb032379b9e65e9b4cec13e4d70b204af20e4cdc824e8
font_01_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 10680 bytes
SHA-256: 9e5d7901c5e72581245e59bff6f94684639b6dd66ed95ea42d0072f489dfd81e
font_02_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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