Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98727fbd9dbd09c…

MALICIOUS

PDF

86.9 KB Created: 2021-07-06 22:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be70bddfe80aa26f62ad66320d110ca4 SHA-1: b95b0e0b57db08bb5791d52c3f32115bb2525703 SHA-256: d98727fbd9dbd09c91c9463616bb90cb9d379b31823e33d9e73a07e997ff35ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4a6cf5ca59d8e69aafead2ee569ba47c/menopuwogibutigojobe.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/29b7889898bc196fb2987c6dacbb32de/6398415847.pdf
    • http://arslanemlak.come/file/gixabirutojisake.pdf
    • http://hotelbelleepoque.bg/userfiles/file/31825573279.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jrt2i1knp8eukq7rvbelm4nm1h/23057561710.pdf
    • http://diencohoanghuy.com/media/ftp/file/dowiriza.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/800aa98d58145f4ae8cae826bcac3cfe/rerugufosezifip.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9880c2e70f---rikalezizagewawew.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605c199998---vamezulamidigofokojefi.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d44819c90---tixirozijukupukoluritepox.pdf
    • http://daiichilogistics.com/uploads/news_file/95470003439.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/99793858248.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f9d95be7---fezikojif.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/e2gd9uorp7vtnj1alrq40jmfi4/79628689619.pdf
    • http://eternoohydro.com/d/files/22112948453.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc2da9b3de---modipejomifimu.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/mv8m8q79toj54h0v94177693f4/18491151953.pdf
    • https://chris-arnold.com/userfiles/file/49691622519.pdf
    • https://bawwabatrizq.com/userfiles/file/gadobolafumofasit.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078dac471dfb---92086241284.pdf
    • http://immobiliareborghi.com/userfiles/files/32958780576.pdf
    • http://kco.su/userfiles/file/72206284100.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=just+one+night+with+you
    • 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_off0000f2b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 16792 bytes
font_01_sfnt_off00010aca.bin
16c59406ac2eae5ba60f5675bce14c997027eebcedcb13188f039ece84c0c1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16976 bytes
font_02_sfnt_off00013749.bin
702e730b40d413a6eb4c9f9720c5601d51841dab651437b1664dd5160a03856d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 10372 bytes