Malicious PDF — malware analysis report

Static analysis result for SHA-256 058a708a0859c2b4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 10:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2c2fdb251f7e94bf087a70288a8b164 SHA-1: f17ce42612e735a0135ab4710f48ddc334ea837b SHA-256: 058a708a0859c2b4353938f4fe731e069bbcdc0f545a16bf282bed89be373c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or malware distribution campaign. The file's structure and the presence of external links indicate it is likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=achilles+and+the+tortoise+pdf PDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/58f62ac03d7a2bb663b6f1751fc72f44/tofodonadenizevove.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/perepix.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/25412962815.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/72973249987.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021080407091873499.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b516997dcf7---baxeretimune.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e5ba5f3a---doluluxusamefa.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6cff9144fa11323872e2e232bc91bde2/radakasanusufozavadi.pdfIn PDF document text
    • http://vhktn.at/images/content/files/kidinozowokobinewa.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/2e2407fa410991f9b38d0c291415afee/matelilokujikikojigot.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074688928cbf---tenezam.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/44ff8b7ed0139c24075b5034c7b11055/rogunokilajokumonuxedezen.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/56950210707.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551ab732b7---48771001080.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/29538955795.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/rizifigodokomibupej.pdfIn PDF document text
    • http://fitviewer.biz/files/file/nuvajerememujekosogazofiz.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/55531186236.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/60804312674.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607554d636479---1904467296.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/77168447807.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/bipapugi.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_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 19256 bytes
SHA-256: 67be9597e5a72ea8dc29dacb59d8749527ac86045ef708dd30b630b3e247a09f
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10696 bytes
SHA-256: a241d4629bbca9306f0901ddcfe190777355c342971fdf49a35859f459f3607e

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