Malicious PDF — malware analysis report

Static analysis result for SHA-256 a855a876287ebc27…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 19:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24b8d3d7a03cacaed502bad66f85117b SHA-1: 4503813ea48b4d852d3049d1957eac9352cb0931 SHA-256: a855a876287ebc276f2fac8f75a9a513221945d65f83cad295707d4a8e57d80e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=my+grandfather%27s+clock+piano+pdf PDF link annotation
    • https://ppntassone.it/dati/upload/file/10124195226.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c48426abd---96371986382.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lewipobemajuruwomuseleje.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0371c6ecf---pebemo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e889608d---58798244986.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f63c33c2a4b8e01cd936ad24187ad04b/76034505820.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/85211420082.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/5114321353.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/bokonilajaz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p3c7nk0ssrnl6utj1bekdomcik/90804698413.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/burolefesexuxivopesik.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85648879809.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160904d302b036---rujikutejulololibemarifow.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/tm5361u1us7bulhaemgme0tvm6/78206772714.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/132305f60a0ce4b971c2a8018e885c64/24453841431.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97e41848ef---jobuzezanigovezuvixafiza.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3f39120ffb14289d31930684a2ccb48/62035662046.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/nonumosudoto.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/70152245901.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/dutetede.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zuzafusegugitozidinamijub.pdfIn PDF document text
    • https://badoza.net/userfiles/file/83399435465.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 11132 bytes
SHA-256: c6efb92014a7ad21d7a33136d8dda04d4d844f0cfd1ead54f30cb1101e1733f5
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 19836 bytes
SHA-256: d8eb76a727aee2261a1503389557dd7c98b8851e51826a17aef83c57abf68d30
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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