Malicious PDF — malware analysis report

Static analysis result for SHA-256 71795647b159271b…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 08:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0f1e2aba040989f7e6164b167b4e853c SHA-1: ba31b569da258d971d5b1f8cc95b65b842eb8e04 SHA-256: 71795647b159271bfae6282be2edb5f6b4fd991c4769beadd74d68aff2bb7bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

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://advantagelic.com/singhania/downloads/file/77196417634.pdf In PDF document text
    • http://ipublicity.cz/data/file/jetolivejowadubupurap.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5a44fd29---vovopuvizerisazutewitan.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bbf5124d3---49591626849.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/30746647469.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/97f697c7c5a72b69d68bccf3778a27cf/39855715199.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/24710132802.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f0504e74---29214975318.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1f0af71a---15519187231.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/28504937836.pdfIn PDF document text
    • http://rotang.net/userfiles/file/52066507507.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bddaec56---46864128493.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3hp7ke9ln85h9r3su99uscdjfq/89726431751.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/98113304214.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d494c18ced---44454564323.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec56d2771---gemewaduxoxunolideneva.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/06b4e24862d72de289fbb06bf88221b3/23955686970.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/puxex.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/idm9tg7uvd58ecv9t9mrmhi2o7/bomudigikufudubokuse.pdfIn PDF document text
    • http://teraval.cz/res/file/rebobalidogetij.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/251379d058d526a890355b3fe13c2065/gatuxiluzazorukixetazajab.pdfIn PDF document text
    • http://garderoba.sk/images/_file/memixiviwixofoguxefuwedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=smoke+detector+beeping+with+new+batteryPDF 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_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16516 bytes
SHA-256: 8734a4a9c4544f25086e8074171f9ec06d1490e0daf1306759ef2641f851777e
font_01_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 11256 bytes
SHA-256: d92f7e7d150687c90c504221159158e47c2cc398d8d7cc9c91af9fd2f3cea6c3
font_02_sfnt_off000135a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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