Malicious PDF — malware analysis report

Static analysis result for SHA-256 874eda55883450a7…

MALICIOUS

PDF

105.9 KB Created: 2021-09-02 06:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e678c07a021f33c4f5e89e10f5708f53 SHA-1: 8b2afdb6fcb6e2371a960fb86afbdeecc1cb638b SHA-256: 874eda55883450a7ae5e1ce7d31f7b7cc3ace36466565fa04f0fd67bf76f032b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a975b12b---83779015531.pdf In PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/73022072263.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/86141851099.pdfIn PDF document text
    • https://keongracun.org/contents//files/taxuregofepidez.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae17e083c---66427560391.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/magenomazijozudix.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/38134843891.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/sulofibipavaneraba.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a84d9e84---zekanupi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a586f7832d5---90307977316.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072fec7accf5---vodanetanadowupijivab.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5d442edf---90987239019.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f7v9dmioljip4ris1i5a51kk42/kemexusodiwikop.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f637d0ec58---44997171139.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/dufikazigusewifetu.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/xilojiwurufamif.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f0d11ad3---wolijisusukovadogofidokop.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8mhbb5ipskm1ii5amcfh2priv1/40461443803.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/84761198259.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/26465307079.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/savinewinerofumituj.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/16/72296886579.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf790e047---domigupiworagotog.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c320fa56907---86652792243.pdfIn PDF document text
    • http://lactopad.com/uploads/files/wigabukomeg.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de080d53b---5710168214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=who+wrote+psalm+92PDF 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_off000137ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137ED 10688 bytes
SHA-256: 3c1aa614fe2495aa50d6e92c7cd76686e082df0f09f173e44c6d88746c8388a5
font_01_sfnt_off000150a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A2 19032 bytes
SHA-256: 7f6377f0f40adc191cd2d018f56a6806f13ad94213efe9357fa053ee5f8a4de6
font_02_sfnt_off0001815a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1815A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1