Malicious PDF — malware analysis report

Static analysis result for SHA-256 84887cca2529dbeb…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6e89dcac318471e8f6f1ffefaeacf93 SHA-1: 8c59f0ca8d5d116e58274288b4e53c3e66734856 SHA-256: 84887cca2529dbebd5eef958e4d40374e2842b84e208fe8f9fdc11e05ede4d72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites or disposable domains. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eff71d58c2cfb4f47e3a4f92c7667cc3/87438135406.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160782e69bc4b9---kixarotox.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/30351835403.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xomurikew.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/vatoredam.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f222e3db---kopodemutanapavorokipawim.pdfIn PDF document text
    • http://dentherapia.hu/files/file/32278619794.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e132d3a486---nemakugadajexuvinima.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/gazamuge.pdfIn PDF document text
    • http://seritour.com/rsm/files/lodan.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c226e7e2c9e---80715224034.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/45022097623.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/mapufunukogakefumuwixubiw.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/91gn5i12quod6elgqpc8nrqpi4/zipidifizipejef.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/fubomo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dfa8bb9bd---tonejadunaxigaruwabumat.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cad3e31be---62606550916.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/87955441391.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/jonewijusodupigakumidanu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdl65l60u4ai4k27an8pa7cdh7/41723632312.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e1bc565f74fb96907014186f411bb686/megenageboxetuj.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/39d366b6cdc0ea36c1f61a2fcb428db8/jesekejetis.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kutidefijitezize.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1725b77e6d---78266732266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=singular+value+decomposition+example+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 11304 bytes
SHA-256: 139f0569a2d4e6e9593a56cb4a745d6b99cb54b396e439e6ed6cb9407ac82eca
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 23376 bytes
SHA-256: 4c55576b6729780147c60416a1b7a2fb197a1aab2899a3693d2ef99bd6fb425d
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A06 16968 bytes
SHA-256: dab35d7d8e6c95fcb64a29763d6ab081fae1da6a475d7d8c99a33ac0b9febabd
font_04_sfnt_off000152d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D2 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583

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