Malicious PDF — malware analysis report

Static analysis result for SHA-256 78928f69fefe6aed…

MALICIOUS

PDF

93.5 KB Created: 2021-07-28 10:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a39577364a34d48483e5ba8bc1e628b3 SHA-1: a3bd3d790ab90bfa6a8c69772eeef5d92336ce9b SHA-256: 78928f69fefe6aed96b66e2d62884e87164b299ecb9031488d509adfe8fbc4c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body was unreadable, but the heuristic findings clearly point to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/sljd3upkndgg3ot6suobu0sqfm/44252394544.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/df471308de79e0c7b95e19c5e2d15829/94508639014.pdf
    • http://laros.cz/UserFiles/file/98206993248.pdf
    • http://timnhanhonline.net/upload/files/54255293823.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5425e64f454a0115878f15c1b2ba4850/givulagofegu.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a240cc31645---jeturedowatulidebipi.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e98a3de165873598d01a468c075ad37d/24410341118.pdf
    • https://pima-alarms.rs/slicice/file/tuzezofesavapavaru.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/11690339425.pdf
    • http://airbaankhubon.com/userfiles/file/tamirajubidesizure.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160982e8fa1b34---bafipozonasetedavofig.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pms6rh6g3f8osjesdvogkvbidu/67196495107.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ssg80r4658q3io0rvj9cumbqej/jovubinibidovokax.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/83971f13b11af2fecb2a743d5c0fd389/70660358463.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/s5rk3srqah889hb3u1vvv35a6q/74612852250.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759c0cc63b3---dizomolo.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d5140f657777a93ff7bf1f209ab4023c/koxapaxazovalitesevapasa.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d4b16ead---jotebeluvikakeki.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca832d9918---fufubadenifi.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/12655572445.pdf
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/samij.pdf
    • http://aarogyamedico.com/userfiles/file/72888643556.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c95cccf---66069541302.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb1f19206---99363649107.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/csjtf36pisgk7kda19kldpqqce/titasavawivinekiduwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=west+side+story+music+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001085b.bin
5b034c2658ba6f27ba4224d3237ddd234ff00fed56852f58c3d863325a7be192
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 18304 bytes
font_01_sfnt_off000137c0.bin
b990a5f994cd5b4bbb3157762a6e3a2acba0d546b1e4b5b89d9c107d28ba7253
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 10676 bytes
font_02_sfnt_off00015055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15055 16792 bytes