Malicious PDF — malware analysis report

Static analysis result for SHA-256 045a4c546cfbc60c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 07:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bebd62abf5a1b06fc78eeed12b28c35 SHA-1: 67a03bd2fae85b0d8103e721f570db1269f5b6d8 SHA-256: 045a4c546cfbc60c4fec76de84cf065ad7131c0bf042c521d119fa417eaab6a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://silesiacapital.eu/data/file/17632807489.pdf In PDF document text
    • https://newcar-rental.com/uploads/files/202109121805135464.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/tiberomamawi.pdfIn PDF document text
    • https://basisangka.com/contents/files/90175549243.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/babaxoveroludedotapawovo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a23eddca8---numit.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/vajovetime.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/91032135681.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/finisojarafoxawakuzi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/82218588674.pdfIn PDF document text
    • http://edituj.cz/res/file/vemabomaben.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/be53e88e1043d9f3a484317ca96fbd08/zifaraletosodutabujul.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/mawutudomemuk.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/35736328102.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/tosalemiwowodalavusiwuvug.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/060aba06f5e8de3b972a1a598b45a9f9/59797040674.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/10710687775.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/81673566030.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e005117f---90005457099.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/satuzig.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/3109516096.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/sedakep.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jonomejakor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+mania+mod+apk+latest+versionPDF 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_off0000bbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 16856 bytes
SHA-256: 231c4b4fc46a9def77f330790736635527508342b543e7849edf74a67260c61c
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 10896 bytes
SHA-256: 75d2e6f905211a06653c6914e350d12259e7da8c7ae4f0f0eb37c94f0aabb80b