Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acf504a67dcde03…

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 22:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 431adb69592774b357d82b6ddea86f09 SHA-1: 63a3d8c47508d40754c907d9410420ccf124fb0b SHA-256: 1acf504a67dcde03cecdd0a881a231251fa7d0d8fb20e925ca9b8162dccaf2be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://garglob.ru/uplcv?utm_term=do+you+rinse+teeth+whitening+pen PDF link annotation
    • http://animationcoach.com/userfiles/file/37767802162.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc493eb143---gofutoximezebuforesiwaz.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5b9e7797bb2bcde62d28d0d22c130bf1/remaxotomubepurilajogaw.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/91945011852.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b261c77f0325d865d100f12e3b1b5f13/pusumutegafow.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090348737d15---walekekuwilize.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f6f60eb3edc6fe0ebcd663f7280b612a/60701101282.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc04a6c262c---91909959661.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/latedazofawubinipozen.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210603_1673B7DC0A74AA70.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5f18293a298e1969054773e6b5aec341/21160946279.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/puvidibujotasidalagof.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b691ca0b88d---dedupusom.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605201442.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bccecd3fea2---44973606825.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/nonoxerutavulis.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb6101b9f---99363057013.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca0004e45---xuwifironujilakujobeguke.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/abbace5c9310c7020a27e8c0b3da56ca/57066135596.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/pevif.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/63381230890.pdfIn PDF document text
    • http://chromatographvials.com/d/files/nimenerevawaxafoxikaw.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mn5osr5vuh4mhcv9vs4bk3g4su/35306968318.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/tanobopolafewowupujex.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/dudiwizakukoseni.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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 17688 bytes
SHA-256: 7c79592645330f9f082472216e16fa89a094aa49d476c259cc7e52f4f14b3f5b
font_01_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 10624 bytes
SHA-256: 8e1d9a44f9a0b722d6487e51d89c2fd3e5bb4d8f86a56864c94e7b8ac16b4844
font_02_sfnt_off00013d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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