Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88e41f223b1abe6…

MALICIOUS

PDF

74.7 KB Created: 2021-07-12 16:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c2930a6070aaae03b4b41c488bcb1bb SHA-1: 9c9d87bcfda5d53a56ed076bf991fb570760cdb5 SHA-256: e88e41f223b1abe65322fd49843fcd860a30760193c98041cb0b72cf18e7ec08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the embedded URLs and link farm structure suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://queure.ru/uplcv?utm_term=list+of+cities+in+kentucky+by+population
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e5eced693c6aefc03613e0aecf9ba0e6/sibajesobovovesulub.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/97198123073.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/dda38a80ff1dd26b82bd11f7883e1bca/gedodagovajibanebebofozis.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/14da8bf6885f76ecd35d2356caa5f892/dupitavamemiponupek.pdf
    • http://lica-mpt.it/userfiles/files/53423212091.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e0189f0d8ea42c2ae96953b5bbaae2dc/woxajuxibuweme.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de07d8ca68---41341344299.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/92960866286.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a7fca395---98564193193.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ft23e7qi8h6e5cn526hemg1ht4/wegigitosidojukerogipotoj.pdf
    • http://reneenicoleevents.com/clients/865995/File/98067745956.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6b7de1bf732f50b1285ff8b56828094a/sumajine.pdf
    • https://dacinsara.ro/fckfiles/file/81753652276.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d836b3f69d---5870386950.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/20733730102.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf241adb4---38278062518.pdf
    • http://maility.pl/_ADRESuserfiles/file/15972080758.pdf
    • http://www.dean-cpa.com/files/adminpic/file/bokurux.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c0bc0dc498ddd2cf47a0b5a69261e08c/dotezurilejekesazawuwuk.pdf
    • http://ceomit.com/fckupload/file/goxupogejogizusuki.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160848584a7233---novibezugukadagovuzexu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c283.bin
df870cd25abeb88165dce713980ba6bf177a1ca77131fd6909711c06860fdabc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC283 16472 bytes
font_01_sfnt_off0000ecf1.bin
6cf16ef8ece40a8b980a4166ba6aaa76056c8595a3327acc42b71f3da70a8f34
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 10776 bytes
font_02_sfnt_off000105c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16792 bytes