Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911ea26ab2ce16c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 05:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fbc2c4aba379fe9d952847b76d67642f SHA-1: b303af67a088c5441b0b0a2ea65c8740664e8827 SHA-256: 4911ea26ab2ce16c7b10d975bceaedd94b9540f1b19adda1637ffe102023d9d4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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 70 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ambulatorioveterinariorigolon.eu/userfiles/files/72648224251.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b9e64248---gitufitapola.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/9382863603.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/dusuboponigixitumadux.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/29650654523.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/legixut.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/60518739f8599bed4544774a6c04f40b/nesarubo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1fd484316---xorimobifude.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ec988bb51---zajupupatewizabitolojatox.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/77766389328.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/16705481097.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/vafotazazoloxusafoko.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160730f359ccf7---61362538984.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/vagonuwiberufova.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/77686961290.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c3e556f19---2207094009.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078b715270f3---98107690375.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c8a84c8f9---52055831363.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oh0l0k5imflhos3a2bcurb11j6/waninodutipe.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/93899580069.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9823215774e9da884c3de0f3b0ea2528/jegizapeti.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/77556458034.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/99141616888.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/72147282715.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/43039598249.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6b4245309a29f61bb5ad73a458dafb33/4123386688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=french+conjugation+present+tense+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73F 11060 bytes
SHA-256: b02986985cda1219d143d04e01e492a009571e645e121741253d046609fe460f
font_01_sfnt_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 13808 bytes
SHA-256: d7c1421f188fd8a22c7e185685002db8a1879cbef78a4b14145199140f7c45bb

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