Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b4186b25ea993d…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 08:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 239060ae17428f540127b85f5699bbcd SHA-1: 4c221dfbb2ad3a9e355b6f911de89cd63bfcb0c2 SHA-256: 97b4186b25ea993d6e09f4a49479f6a1385bceb3bc139e72277148460f23bdfd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, aiming to trick users into calling a provided phone number under the guise of resolving a billing or security issue. The presence of numerous links to compromised CMS upload storage and disposable hosting suggests a link farm designed to obscure the true malicious destination. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of further malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607921de941e7---lenukiwo.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/9253d5d91af677784efce54c9841fd6d/tokexolufivipiguvubub.pdf
    • http://wabasnb.com/files/fckeditor/file/180826804760be34190b69c.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1002b8799834c8718dfd9dd155d10651/zoropukafodinigijerikeko.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778f6494b2---dapikanivanegaboxazigew.pdf
    • http://cheumst.com/upload/fckeditor/file/88766999766.pdf
    • https://aduanaldelvalle.com/userfiles/file/gijezaluvazowebajuvok.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7j1oj4uj5nvq5bh602uv7ffke1/voririnenejesizavedoba.pdf
    • http://assushop.com/userfiles/assushop.com/file/jezoguji.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db01e71f5e---ritosotit.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9c673810---vovugekaxovis.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/23ed05814551b7c0e0c3f8a86f6566bc/84743522104.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6b98582d1f2fd1a64a57308673593d7f/54280932733.pdf
    • http://dienmaythanglong.org/uploads/files/bomubilexepavibexurer.pdf
    • http://medi-sen.com/files/files/feboloxezovolomitedise.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jupova.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f746341f6---vazutuxagoxo.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c534966755b---89232690818.pdf
    • https://7gking.tw/upload/files/70949964787.pdf
    • https://motoquadro.de/userfiles/file/11609106136.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aa18919ef0b32774c22b61741242a5cd/bitupunakajatefe.pdf
    • https://presstone.hu/userfiles/file/lolusagudeb.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/21ohpbevofplk6cnpmksu2nuv6/gagadipesipakono.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb28db8b6d---91297859450.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1565b0fc3---vajevagipijejawovug.pdf
    • https://fanaf.comarticle_ressources/file/627724142.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41157ec69---wumedosedejuvineniveput.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=unemployment+answers+to+questions
    • 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_off0000f60a.bin
ef1fc87dacd943f7d834625db1bcda1cd4766fcd03886bc42aad4d8c52d5cc14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 10868 bytes
font_01_sfnt_off00010f2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16792 bytes
font_02_sfnt_off00012741.bin
b2f2fda21952f4b471841cb24a43b78d75bd9650b4ccac14e31693ba04abcfbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 18388 bytes

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