Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cc2728ebc68506…

MALICIOUS

PDF

87.2 KB Created: 2021-07-20 05:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b0dedf589f71f3d5d9a32b255ce18b58 SHA-1: f60dad8b3e063bb864a011e76f3109cb0db9356f SHA-256: 89cc2728ebc685061ec674244ade8e785dff0732ed0aa2c8a1ab2e7ed876b228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aaca3de0---82664277096.pdf In PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/lukuzawibabanikakiwapafu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/914764e2014faf2d45359ce8579ad005/74335261015.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813518b215a---kuduvizililivapovanola.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/10191703250.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/24777303671.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/34oltqsja7hgu518aglkueg9c3/moxozimuvixefazukenusunij.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9163cd9552279baceffa3256082c0d64/wivowarewemamogufivezopaw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29355489430.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//kutemesigi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dtn3896dhp1ksdoesaetj6eapu/4655042963.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zupanos.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/89773766685.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/debejovusan.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cffa48959ae---tukovutelukexugejixaw.pdfIn PDF document text
    • http://sns.hu/_user/file/pasonoxamomagaropik.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608444fb6ed22---fupejuwimivokejedemow.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f2adb7f9bb7a8abea31478352b1c474/mubovaloga.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/904f4efeac8bcfbc9e02e7c4b41db3a4/75523495278.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c58d7ef82e36dc8b1c0b4f33ece8b685/fekisuva.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/87178360027.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bbvf9tl09oqe4e0egnjbb2dl5t/favadexawenofibapaf.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/limetenijudiwit.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/gijujefedasafajuzu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f99401880---witepoxukesax.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dcf150f4ca82f00d147e63c55945bab2/61843631672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+remove+watermark+from+pdf+online+for+freePDF 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_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 17764 bytes
SHA-256: 6c38655570e4b4ad74d6a0f6bf4b70bf6219f39d3afa88fab7799548eb1788c8
font_01_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 10728 bytes
SHA-256: 9ac71c9e94f9811143b24664cf956733e550fe2655d04f597a24737abb108dc3
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1