Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c91c2c3b4d63a2d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-28 01:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d28b66334315c65fb9d1d6730027341 SHA-1: 68f80b71dbd452d0323cb26a723b3cdfa1c30147 SHA-256: 6c91c2c3b4d63a2d43d39023401d97444b0197b27cb7d2496fffe5fb9abbfe74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely to facilitate phishing or distribute further malware. The PDF structure and the presence of multiple external URIs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/1752242960.pdf In PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/zumerut.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ec38676f493e9485d96cca368463d60e/48010065133.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kovufevaneragileku.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc885a4f0---tevif.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/33163642419.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/50305918822.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/15033637863.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/59737353702.pdfIn PDF document text
    • http://pronobile.de/catalog/file/86466423434.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c17816d1---48655933753.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/63184683967.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/34683570768.pdfIn PDF document text
    • https://bloc-immo.com/images/80060225027.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/megutitiladedezusogisiwal.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/fexivunadoxud.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608162599f143---47133820711.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/22416946612.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/mudonolajadadonojironiri.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fe52fa64ecf---jeraferuralopuwokudotig.pdfIn PDF document text
    • http://livestocktool.com/d/files/77421211105.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/77976689398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+does+a+pnc+bank+cashier%27s+check+look+likePDF 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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10868 bytes
SHA-256: 1e60de5ea50c140a5385e3caa00958d8e5444d3b489419e3f22e9ec1109506a5
font_02_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16432 bytes
SHA-256: 07c61637295aff9a4707ba43ffb14298960ee5622f210900c230f42ac834feee

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