Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dbb539b635e828…

MALICIOUS

PDF

86.2 KB Created: 2021-10-06 23:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 17acb91946566b43cedfe8c9630d43c5 SHA-1: b0d617d0fbeeab7678e6f72813f5b19fded36cbb SHA-256: 53dbb539b635e828b119bcac5596737967a99e226ade81d3d076db03d20e037a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. Many of these URLs point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eownauto.com/uploadpic/files/80232342880.pdf In PDF document text
    • http://parateam.cz/file/72233336261.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/rugiruzunewepogelori.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/ranasubomibapezadir.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/gefawenapikupawa.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/lekemelaji.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2b4a6b1b---88479250881.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9a9d206a33a3da33a6365444c87b29f0/46827928770.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/63127527138.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/kozarekevidi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/623a7826f879ee6889604d2259ce05fe/pobajijolisidu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6142b739dcc429220da2afa020d27968/fodafeweluba.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe9f97433---8192239956.pdfIn PDF document text
    • https://jotelek.hu/files/file/malifamatavofuginawedo.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/19323745699.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/62138328986.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/wopinavesegadaxezepalune.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/verogafovupanebozulat.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/josujoz.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/93815192022.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/vijinisavuwiros.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/25361979627.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/37907470574.pdfIn PDF document text
    • https://adci.vn/data/upload/file/xolesobafulavakajif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=electrical+engineering+technical+interview+questions+and+answers+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210927/16327189814917.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 19112 bytes
SHA-256: 2a657ed216622c76d10a2d7a7eb39041f1ad3421245cd8b211912191f700fcb4
font_01_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 11280 bytes
SHA-256: 58a30bb4677803f300bc99fd4fd2ba84a822dd2046937e8fb87b21e9f0980b3e
font_02_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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