Malicious PDF — malware analysis report

Static analysis result for SHA-256 a129597d02795072…

MALICIOUS

PDF

94.8 KB Created: 2021-09-18 09:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fcb0e558077443641d73e74b7064e68 SHA-1: 0a1845d74bbc615f0b5763c5ccc9d044199b9c4b SHA-256: a129597d027950724b9b875c29ec43cecf1ec941055e646351abe4b1b8074e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous URLs, including one pointing to 'coretry.ru' with a 'trial free followers instagram' term, suggests a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://coretry.ru/uplcv?utm_term=trial+free+followers+instagram PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4623233e4---55219940116.pdfIn PDF document text
    • http://simonide.org/userfiles/file/20614732749.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/30258318459.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/57492597629.pdfIn PDF document text
    • http://badgerhillfarm.uk/86169484279.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/21809920960.pdfIn PDF document text
    • http://podushka.by/files/files/zidomiwu.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210908005402.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/87320160369.pdfIn PDF document text
    • https://mmtours.si/uploads/kafufivanuriv.pdfIn PDF document text
    • http://charivne.info/images/file/70207948731.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/nuwomusaba.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/57334584450.pdfIn PDF document text
    • http://szm.hu/userfiles/file/zutatadatevajilojiludon.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/87814222449.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/56855517555.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2ce85255---xibedolejifu.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/zosowa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe282caad---2283331835.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/84475972981.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pokono.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/51581068696.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/gerixalol.pdfIn PDF document text
    • https://aaaxxion.info/images/file/vivenorazafore.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/wapefaxinudugisedenobete.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_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 10608 bytes
SHA-256: cbd02aeea6f551eeb9997a68696d716fec3a443ee999e774cf8c53c3873c71d9
font_02_sfnt_off00013dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAD 18416 bytes
SHA-256: 5294b43eca4e6c725b9e90d28f2ae8ba1493755031e401d06710683d4057e607

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