Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ed23acd6730ce1…

MALICIOUS

PDF

87.4 KB Created: 2021-07-10 11:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73bf435bf1955e5467569d065f9ecf61 SHA-1: 9c981c260b9a0d8963ecdab1cd809c945ae52d91 SHA-256: a5ed23acd6730ce18619309d95c3c10ee4227b36a2fd315e2047ceb86eca127b
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 payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, serving as a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nqd3ein2q62lju8vu5rduvpaed/tonujijijavexoxatonumiji.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/g367k9viifn7t0ah8kspqdhr83/99153454867.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d8cbed32fbd0074f45dd64e470ff7547/41631657823.pdf
    • https://steammining.com/userfiles/file/24972336394.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6lhqqqaeu0vju4qc1jg0no27ev/goxiwamudajogiladefo.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608300f93bd41---dosemodizilise.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/42e6633143710d06b3e2e856b16c3433/12155957529.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dcb355674---robijalafejizenopunu.pdf
    • http://rgn2u.com/userfiles/files/77280381646.pdf
    • https://its-bulgaria.bg/files/file/68846416569.pdf
    • http://clubselectionvoyages.com/images/file/vobaroruxezak.pdf
    • https://ahreco.com/uploads/news_file/faxej.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6e8df2ea---49889127685.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64af296d6f---liwag.pdf
    • https://agatanorek.com/files/file/wususubafoxitirizuro.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5tou8vr42qf7n9vnhlhijgofd7/93322109802.pdf
    • http://aimic.com/userfiles/file/41414713323.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fbb22f45---46304075331.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/42971184439.pdf
    • http://jjburgerut.com/uploads/files/lidiwiz.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a530a97305---ladubakumoramuxukepasatox.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/xetexezetet.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a8997e3---92651433764.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608311b4c824e---94145189417.pdf
    • http://change-sexy.com/files/files/85374946659.pdf
    • https://xlspandoek.nl/userfiles/file/89241057386.pdf
    • http://dges.in/userfiles/file/20473964108.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=brainwashed+challenging+the+myth
    • 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_off0000efdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 16792 bytes
font_01_sfnt_off000107f3.bin
48f83f9da3f0cb0ecf32825fe94381af21414eb9bb91da5c34b52d6776ead72e
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 10952 bytes
font_02_sfnt_off000120f8.bin
480991f321facad08e4ac7006091c2a69598ebcfdc99b2281f562f3a491dec10
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 17344 bytes