Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42bcb1bdb1e4d96…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 02:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e575a6ee1345040a6c9ce139470d31c SHA-1: d4a75dd2376fb87a509eab940fe7d7ba45abfd80 SHA-256: a42bcb1bdb1e4d968c1d647d89f30ba64de0321fbaefb40fccd4784599adfd46
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/032d0a017307682ee28a653983b9b04c/fopimow.pdf
    • https://uleshuzatabc.hu/files/file/83576041903.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec032ad0ebb98750fbae44be0e92ab87/wafewukofipixokaret.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8346f4ad0a29bc7a98ac1d1ae3455db8/1200560430.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cd29330e529---pomibotujijujire.pdf
    • https://krassimirtaskov.com/userfiles/files/54232275083.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2aa25de3---81617969021.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fd0423d31e064319b2e0b07152f04dbd/wufafuvu.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/19d746cb51b885ecafec2acb217b31c7/28722282511.pdf
    • http://narnivet.com/userfiles/files/8657285140.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e737636a712dbb9f665e7c089fe5bea9/soronewufovi.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1210e36af5---39283060309.pdf
    • https://heyratacademy.ir/file/50004707791.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607432d23a27b---33478130865.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612490b07f099---kijagojunafuwijazime.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/gutufuvugeno.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49dbbb73---xaxixofafawevenex.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cfae360c50def3116df6139d44d09ae0/65165571176.pdf
    • http://hykylalumni.org/userfiles/sejabu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/752aefb36213906e03a255afaa828f96/55211051886.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bcp4r5vjsd0d98ff3rfm41sbe4/gepawevesaratosejetufi.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4118a3356---65909754175.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/66991817291.pdf
    • http://odontoflash.eu/userfiles/files/besafuvafemaxokadekoxi.pdf
    • https://balajitutorial.com/admin/userfiles/file/55936239590.pdf
    • https://ovth.ch/userfiles/files/53240974705.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=which+one+is+your+favorite
    • 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_off0000d976.bin
7d01ad5e5dfcd264b8bb72da1e947556bd8d9bb8597cb72300aac83fd30491da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 10660 bytes
font_01_sfnt_off0000f1ec.bin
3bde974d7512d689d9bc3bc3f9871b06e21c1c07a15d021adca6f4cbb50948d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 19708 bytes
font_02_sfnt_off00012598.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 16792 bytes