Malicious PDF — malware analysis report

Static analysis result for SHA-256 222eda9987c5d556…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 04:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 734618dcb9dab9d9e49bf052a2ed3a6c SHA-1: 0d623083dedd08b940935ad0ab23eff18094f694 SHA-256: 222eda9987c5d5566e4ae9abf336a42f10c8495f6a8c877706a768af082898c7
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a large number of links pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings strongly indicate a malicious intent to deceive the user into clicking external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614be786b7a76---jududogefipozovugir.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/22943543050.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16130e141a34f6---63774333102.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/nivezafemuj.pdfIn PDF document text
    • https://dm288.com/slicice/file/98471175098.pdfIn PDF document text
    • http://househouse.it/userfiles/files/33086141754.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/21550498084.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/kazunito.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_121222.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/64992024942.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/wuxevumilabafaxovodol.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/47276156610.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/senaminokubovevagolupepem.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/65963580257.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/86305859578.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/23066472602.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/56663114682.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/pitumivozus.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f54b46256---tipekawuwopopimowuxa.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615028a53d1ad---bitanobegugerevewixive.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/panikizitut.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/kevijikufez.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/23651559171.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/tasegibowubijotar.pdfIn PDF document text
    • http://contelex.it/userfiles/files/zuzisufe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc13d9b6fb---58244764976.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/vudolejuzufanozufokiziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=honor+view+10+updatePDF link annotation
    • 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_off0000b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 14060 bytes
SHA-256: 7eeadf90192a19432413e4c5ac491153f0794c5212f59dad8fd73694fa4cfb9f
font_02_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10588 bytes
SHA-256: 7fd971645524ba2ce764f15514436971bead8aeb9b28d42055b306339927377a

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