Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3e72e02dd642c1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 23:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c36ea6a879f576104fe2a052d276f052 SHA-1: 39a947ea6573d6ae5f5f27e79a6c5dbf2f35c2d6 SHA-256: bb3e72e02dd642c1fb8abc1c940906da445c2d5854e7a8c31685414277691932
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, typical for directing users to attacker-controlled URLs. Multiple URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tamlaproject.com/userData/board/file/48123505180.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/44168e8321c4ff5bcbc5bb4ada19e9dd/72791183122.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050306312673499.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607965319aff9---4739945052.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/59436282774.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1415d3847---jonuvafegizejavugixovebel.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e920ff7e2f0---92206518549.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607312e01d301---89095362597.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/f104a3bc551ce531fd0b4b9338ac1b99/74022386724.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17299c0f0---suwokabevumuwuzebez.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084053eb8d04---xovisepesonedalebuvotop.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/voxipunis.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tolevuk.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/42724700989.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/mujukedabateweziwoxakaxuj.pdfIn PDF document text
    • http://parilka.by/var/upload/file/29927448167.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vozibolakuliwixesab.pdfIn PDF document text
    • https://afayl.com/userfiles/file/vovesisirutexarusi.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/93929788973.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/618nml6ohkgau099vojpu1qtaf/rafudumagaxofopumo.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/39062559220.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zesagosuwevum.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/91369106730.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/24867942008.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/84843056903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=information+technology+quiz+questions+and+answers+pdf+2018PDF 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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 12028 bytes
SHA-256: 64331e852ce9433b9c7730e56d79de5e4d19fe5183f52ad3464c722861528acb
font_02_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 14228 bytes
SHA-256: ca356f6736de8b38bd6c3b2b79186e5fdfb7e89851c4c16dba5bd57a7e467690