Malicious PDF — malware analysis report

Static analysis result for SHA-256 947c49b8450cafe2…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 13:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f4a9d97e37234d353754f3ce6b96526 SHA-1: 22e370a5caae6f688e7dbb2a76f12cb952b9eb6a SHA-256: 947c49b8450cafe2c4e00e8b005d5d409d86889514d44b66b94ee6a2d263e1c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed streams and numerous links pointing to compromised WordPress sites, indicating a link farm attack pattern. The presence of ML and ClamAV detections, along with heuristics flagging compromised CMS uploads and SEO disposable link farms, strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444218a972---jonodirudorijokej.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6df1d5daf---vigopitew.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/korenibutabivepa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n0smtd7bsrr997bsms83fmrp0r/28098051114.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/143daa58c3a626ddfb3ca38162840a5e/19354757174.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/25316779164.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986a3b60e63---53314740014.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca51be71b---90162931601.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c6de6999163---18816950119.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/69316527414.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e679ad1d991169cfa5acd333711f727d/silinevodol.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/moo50r8ak008129f43cj8s5ta2/16211508349.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/588810ebaa572a00f16487d3dffd3230/finotipukusadunerasoz.pdfIn PDF document text
    • https://unosms.us/userfiles/file/podujusofuvudeku.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/57928533760.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/65629527559.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d6fe19a97---1178519380.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/40691429466.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/02061d5d4bc11045a295447c4c874112/77539922929.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/19893093692.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b86c57440---tifofuzuza.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6182d57fb3---funez.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/dd3b76a4163df55f34755fa48d47037d/lorowiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=erosion+and+deposition+worksheet+answersPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/44093372660.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25943529919.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_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 19224 bytes
SHA-256: 31090ade074303e98e5bf1e44c7a0b2e8b529dfb8973474466ee1af9590af108
font_01_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 10604 bytes
SHA-256: 850fba5fadc88cc3f124a2e1771b38ee54bea686fb638b9f980ff4c42c633792
font_02_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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