Malicious PDF — malware analysis report

Static analysis result for SHA-256 789872b3bab5463f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 14:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc38eb7d681f9cdc2b7119d276c21fcf SHA-1: 06457b1e965fd0d1e605e9b3b5d37b7c1f0e8fc7 SHA-256: 789872b3bab5463fa69dd2a893e78e097f6f77117929a783b9fa260a255b29d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is unreadable, but the heuristic firings clearly point to a link farm designed to lure users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thedewakohchang.com/image/upload/File/6744626881.pdf In PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/51560895433.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/bidediniremebu.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/88329563646.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/263d25fc018d12c7476c8a3954dc928f/jupifoloduwejow.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c6b052415a9f43475af12166f3c9f9cd/tikujemudedumimufipasamax.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/949b857726311c80c5708162ed497322/9284805372.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099053c9e524---14551500010.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/jorerakezujuv.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/70336663272.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/luvusuvekafugesikevo.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/kuwurag.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a374b9a4bfd4a9dc3d11c937c3c8e2e3/xobexipafogox.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf77a427e---83687124664.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/tewuletapomab.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8df31091---nefol.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/71442791340.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/lirofepinefozam.pdfIn PDF document text
    • http://gr-chem.com/upload/files/3241014182.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281806526894.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/vevigaluwejosupasamufu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2ba8ad5pgc87tj5ddq5fh6dvfu/figevudamavanoruji.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897bc2cc997---wuzapavajetazafapij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=conversazioni+con+dio+vol+3+pdf+downloadPDF 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_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 19660 bytes
SHA-256: aa99b1e387c5ace175cff71e99dfb609eb158b9939b2c759945231ec788321ac
font_02_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 10928 bytes
SHA-256: 1e3d7f424bb83ba59116998b13406253a804f3298446dace6ecde8e5eda214bf