Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ca07d4b78bb044…

MALICIOUS

PDF

92.2 KB Created: 2021-07-02 16:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3c3805c848c91983d965ec4a4df6708 SHA-1: 8e10b408ccc9fc863906af647463a6c45822e973 SHA-256: d8ca07d4b78bb04488c5c6c0482a6ac81ac0babe6d9ca023a2c1bdb87aa0ce79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=dragon+city+how+to+get+legendary+dragons PDF link annotation
    • http://creativeindustries.ru/uploads/userfiles/file/fawoxadixogulexawotat.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b4a177af2---faxel.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d3c4d9e08083a9ed764bece32198222f/27868135413.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcae4c72a3---jokejegaromejufud.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36ca000a9---38239532998.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/1621025323046.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5fae1a7a---laronufegopanudujuji.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/duwanasalovafawawumer.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42a854433---81932149260.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/27069362908.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/bupavusigubalesive.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/mepoxewixoxajofijo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zazenuzokopekisofaraf.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647e54dfe9---romupowenomupi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/disjo670qtb77lgghaml2jbc8e/pewugukuzigilebaranolalo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tivagubiwaveloxodujupit.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/tudetadinokawepusunag.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160894e68d4ec5---besavepotemukikukunudo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8cec1b8e24bda4677d64dc3684f6c375/nanezaj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d758511fca---naxibedirufiganu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c005ae1d660---reliwarimunakorevawagovux.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ec6102861d4b64a538179ca46043e7fc/xiledotel.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0fc14da778299a440dec4d8da1a8443f/budak.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098804b2d902---venala.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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 17156 bytes
SHA-256: 126870dc7254501cd2a24633b01154a0ae4c6f174ef8b0b8215002a203af6664
font_01_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 10852 bytes
SHA-256: 513ad9deea2ef1d00c953dac71ec2f3e28e4ec0341a2535c230956fdd16bcefa
font_02_sfnt_off00014b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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