Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a34404931cf8178…

MALICIOUS

PDF

88.3 KB Created: 2021-08-04 15:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c6ace328fd81b8c85df12a727262f4c SHA-1: 12c50d1613b142b3faacf9c899bd63538fa472e6 SHA-256: 7a34404931cf8178f504cf19afbd84f1182bd569ce1cbbaab13c3263247eed7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which host further PDF files, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to lure users to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3b584342578afcab694523aa97123496/viligu.pdf In PDF document text
    • http://ugrctrani.it/userfiles/files/pipuwuwovim.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7fc146cdb0d91f40e71785b0b5707071/tejegamugif.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9go5rcngai4oib0bqa01qrn2kp/vogunadoredewupigijaferu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/salupoverozepi.pdfIn PDF document text
    • http://fygl.net/uploads/file/092230441012.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b074b1153c4---xinakagokapitop.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/dotavemaponilinululido.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/45330349259.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7kgodovadstd10q1n78ntjvg8/soxokupolerago.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/wagaladusavogevasi.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bilipomajifenunixasibos.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/67214968287.pdfIn PDF document text
    • http://limoride.net/gallery/file/xojezuxiguledorutisekidul.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d2350b3eec1c1899c79b30a100957c40/zitapeterul.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/30244505957.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/98e3df2dbe5f3a9f8886e4fb521ff240/puzamuwoze.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nepevip.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dtj0pgod7teiuoajmku7fm68uu/61630709188.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/surapinosidumedegez.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68380ce85---kigeditiziwadetenubusixe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fb739f2f7be---75302315987.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/76354763860.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/jikamejozesaxiros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sigmund+freud+obras+completas+volumen+2+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 19136 bytes
SHA-256: d2e85a13670ad7c4f0a6bf7159ef64d04bf52d10e6e0aec186716771e41546fa
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 11464 bytes
SHA-256: 81efa3d37c0f00694ec3434c69e744d93c719ac888a8f7a46a7eb62e7dcf6aa6
font_03_sfnt_off00013aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAA 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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