Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e2dd629fad2ebb…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 10:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c753c4ca86a295df263b10f89fd76224 SHA-1: 4c59712a81a1cfe77249a223699f04335d1d2b9e SHA-256: 77e2dd629fad2ebb18a55e02bc4edc09fa7589729d0355f398fd248c098c33a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is not inherently malicious but serves as a vehicle to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://clubslotalmatriche.com/calcas/file/90913070538.pdf
    • https://mumegram.com/userfiles/file/5461270970.pdf
    • http://www.pranabkumar.com/fckimages/file/52073395924.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/h3nis9rpo07v258c7nc5oublfg/bevofinerazipezafob.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b24684670---dutunurubutuzazotu.pdf
    • http://notariocprietoa.com/notaria/documentos/files/suvagaturitudedid.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7b61d205---gixefapidunowolabosuti.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a3312a394---gidovinurezag.pdf
    • http://juentai.com/userfiles/files/40891232146.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2e753f97---pemej.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609758f096d73---83937295395.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca91ae0d7d---52660658024.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464818427b---74021574037.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e419ff3a---25925539958.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6337be713e1d52a31903a31f0cc906d9/bixukidumorexalurim.pdf
    • http://amirafouad.com/uploaded_files/file/25700317212.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f32b1632a---90070114156.pdf
    • https://nikosdimos.gr/userfiles/file/pibutegek.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6f753d7219c2fe137bbe3e464e7f1069/xulavenoluwamujinovuzumad.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5285d68bb---55920550541.pdf
    • http://studiovalentini.eu/userfiles/files/gonexujiwedukejulesoli.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746a76ae0c0---pugoke.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b6bb55c897b0eb7bef0379629dcb918b/jawinobowagakumagoza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=react+native+elements+search+bar
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df15.bin
43a27310e1c922f6648529da54d24973edda7411804ec839d46dc815b156eff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10628 bytes
font_01_sfnt_off0000f731.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 16792 bytes
font_02_sfnt_off00010f42.bin
c23a78767c17a1614fb89d96e2d4a0bb3f466bbc82d371f47e982e9626fb525c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16084 bytes
font_03_sfnt_off0001246e.bin
6fa4d032f694c3beb2bae7ca5f610f3ffd9798fbb0b71c57ae1ae58dbc746eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 17404 bytes

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