Malicious PDF — malware analysis report

Static analysis result for SHA-256 997f1839aa7ac403…

MALICIOUS

PDF

110.7 KB Created: 2021-07-30 07:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcfd134ee5b2bf24eda969cb85de95e4 SHA-1: 8d133af5c63c92ed31e06efc942d3c9e8618ff85 SHA-256: 997f1839aa7ac403337a0f5e8f27db6468be8a94d6df515c01f45b2089164857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and contains numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious URLs is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=industrial+organizational+psychology+bachelor+degree+jobs PDF link annotation
    • https://diphong.com/uploads/42383931084.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7518b21e3---84468091972.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e643c47d653---fudenarevenozuzir.pdfIn PDF document text
    • http://bjallstar.com/upload/file/42098700529.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/88653085962.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71a62813f---87519472277.pdfIn PDF document text
    • http://partnercable.hu/files/98522565227.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/81801132340.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/dobixukabezixukezam.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160cf01bc290cf---72593984915.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1625573133.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/29734848238.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072adc848d68---96112765935.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/90976906472.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/wuvezelemurida.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900e1b3b74c---zulajasagedumiwu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607446522792c---beviberujafuw.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc77999784---17727966032.pdfIn PDF document text
    • https://carlojans.com/cms/file/bazasavutededojatakek.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0876ad43775f55b2f09429ea73d14972/suwifalidadij.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/jatisikovapu.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/79967908989.pdfIn PDF document text
    • http://kme-kme.cz/files/file/pubuxebaje.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/28350292148.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe98ffd93f5---82663657460.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_off00014afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFA 11288 bytes
SHA-256: 2d36c2241852aacfb84b82073280b25ad3b4e56dfaf522452ff23a3afed0e302
font_01_sfnt_off00016508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1A 18024 bytes
SHA-256: b12923e45a39528a80d7e052b113346e45ec4fbcfb5aaac5c7adf7c530594a3a

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