Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c946f31d3819ac…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 22:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd2f8ac1dba29350b05b2a25bc968a1a SHA-1: 029b19afc2a31d292bb0b76cccc91d9fa4ab20c3 SHA-256: 81c946f31d3819ac4d196ad88e8e1f9e46dcbfed5e437770af0c05c474c1dd9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and link farm heuristics indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://teplo76.ru/uploads/file/21825588266.pdf
    • http://mid-europe-ex.com/images/blog//file/genimotirulis.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/663ae744e6675f4fdb5bb97e52f2f04a/16261367200.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8858472c---mojuv.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/56d3afae2551286c1f8762d3f21ea65d/24036551696.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/79038c0a6d0d8db7d4593f56ee62bd21/22557040179.pdf
    • https://arte-salon.ru/upload_picture/sudujurup.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be701c11035---97908948242.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8c23c5930fb254b8eb85ea13f6803135/resopatiwameroditilonotiw.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f07971d1b---nejuxebujarenegisolokev.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/97170274542.pdf
    • http://sobsai.com/ckfinder/userfiles/files/48075324444.pdf
    • https://morganmethod.com/ci/userfiles/files/52110684696.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1f9e25352aea8830d1ee89172396b266/80231447829.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9dd3e43cf---63870524440.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/cfcd3893db4ac5e7026a70311e95868f/70343181841.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9na9ranm3c5vvm0lt03s8qcfuk/jazaka.pdf
    • http://kimhoatra.com/upload/fckimagesfile/ziwogadaruxiro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fc64bf05---53141325827.pdf
    • http://allaboutdowney.com/userimages/nilutesepapefepu.pdf
    • http://studiogaleazzo.eu/userfiles/files/rigez.pdf
    • https://limblength-sldf.com/userfiles/file/58437928621.pdf
    • http://alacarte-design.de/userfiles/file/gijetilavezojusoruxugu.pdf
    • http://odpadykj.cz/UserFiles/File/72625255363.pdf
    • http://aceonlinementors.com/userfiles/file/81491474847.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=energy+and+the+environment+ristinen+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 16792 bytes
font_01_sfnt_off0000efb4.bin
4799de9a0c6e3a2376993d48eefad76f115a4bd130556cdc48e925979ca5075e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 11060 bytes
font_02_sfnt_off00010916.bin
91816f2c1b4424b37ead07b089d353b5e26e16dccff2c30313b87cafe78b3c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 18216 bytes
font_03_sfnt_off00013844.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 16140 bytes