Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab746db4788209e1…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 10:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d787dca8f4e86768485bec7d04484824 SHA-1: 90ffff79b5033fbf02e15b22c5df0912e7b415a3 SHA-256: ab746db4788209e129383564a3436e9a94b447865b5c2acba71f4ffe8ae62d93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malware. The presence of external URIs and a high ML classifier score, along with ClamAV detection, strongly indicates malicious intent. The document body was not sufficiently readable to determine specific user-facing lures, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=outlook+apk+free+download PDF link annotation
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/lemafemubaxoregeribojolo.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/nubewogaluzov.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6e845636---wosusugowutotefijaluwoso.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/c628tfr3978p96459dtbpgk7uc/roxadunogepakosupipilus.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/88576c2e5ea8faaaffee3086bde12458/32808047588.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/t9gq7uhr7pgiqroplgof6bitvv/96603618915.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48ee802bf---96052814938.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/dovopajibadejidanidagop.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/78385870920.pdfIn PDF document text
    • http://primaneighbors.com/userimages/62485323301.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ed2b0cbc---gumilekozarajusak.pdfIn PDF document text
    • http://adveotec.com/img/file/14018486201.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kegivar.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e79d9971f---perosusobesav.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111edb04b3---daguxekekido.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5b880cd1---19557571374.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609831d5ea021---40663594097.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5eda556b---kobogajum.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/6787666008.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/90198230435.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/uua4s5ji1fgc1pkrev3civuts2/vudulaj.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/56266535434.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/finapiximejatefakivijavev.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/45259526224.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/32180932512.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785f3fe570c---2146761344.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/23386699008.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_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10536 bytes
SHA-256: fd600369e2b42a19fb977ccbd8d6d14d6bbef564c106e31d593b6aa4c384c31b
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 17356 bytes
SHA-256: fc2c50d83ca8b20489697ac430803370e6086261f1c1dbeba5e0688a4baa39ca
font_02_sfnt_off0001363d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1