Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c568bd944034fa…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 21:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fb35fabad381b0f8f9b0becd9b73c09 SHA-1: a0d73fe59a823bb6649c054bed3caad7fe8b700e SHA-256: 59c568bd944034fa0eef435cda9ea8655fee5d6b237cfb9f6e94ea8e7a32b77d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple distinct hosts and disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://greenbrier101.com/userimages/69435987365.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bbdc83f7c---63979453194.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0c5e3ea7dd78a6dc9fbd7e7a2ccb6be1/57322663177.pdf
    • http://swingdesignhk.com/userfiles/81314047265.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d8d207caf854eefbb1966b8fc7ffcc9/37884381863.pdf
    • http://nsdadventist.org/FCKData/file/dasesenamofiloxomalok.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3fee83b5d26b1cf9601f917fccdec3c5/razivirumunosipaj.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68e87572d---92764932258.pdf
    • http://botosani.ro/img/uploads/file/61654356215.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719dc119a37---87536181693.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/91056847330.pdf
    • http://montaze.org/democms/userfiles/file/suvovowikeweremadav.pdf
    • http://vyrukrc.lt/userfiles/file/rosulufogegemiru.pdf
    • https://x-software.cz/data/file/62053826263.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/68523988256.pdf
    • https://chp-travel.ir/data/file/84175165161.pdf
    • http://champaigncursillo.com/userfiles/file/viwavazogedevapodujisugo.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8e3f149d76e8961d1fbc8f2d73175628/47183353847.pdf
    • http://df-2.de/images/daten/file/84672795656.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d3795b9782b5413c597093f962e2fb4a/43138361864.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/webigexamegosonovako.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3d6393647b5dc79b10e6703695bd942b/libumipafakovuwut.pdf
    • https://giga-tronics.com/userfiles/files/tepifotovekisedubetabivi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=old+work+at+a+pizza+place
    • 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_off0000f384.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 16792 bytes
font_01_sfnt_off00010b96.bin
6328588d6be7da9ae726901956c40117e3e3f3b9f3585719646833281194782c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 17468 bytes
font_02_sfnt_off000138f5.bin
a2e4f9142a35b7194ff22202d35f81468a122b414d5231a1a5e3ee353bc1a848
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F5 10500 bytes